Using high build primer for exterior - Fiberglass RV


Reply
 
Thread Tools Search this Thread Display Modes
 
Old 07-02-2018, 09:50 PM   #1
Senior Member
 
fofobraselio's Avatar
 
Name: Mark
Trailer: 13' Boler
British Columbia
Posts: 142
Registry
Using high build primer for exterior

Hey friends,
Just wondering if anyone has used duplicolour or other brands of 'high build primer' for priming the exterior before painting, they come in rattle cans, found in the automotive section.

Ill be rolling and tipping with a single part polyurethane paint, on a Boler.

Is there any reason I should NOT be using this product?

Thanks for your thoughts. Click image for larger version

Name:	FP101_030310.jpeg
Views:	19
Size:	17.7 KB
ID:	121365

Sent from my ONEPLUS A3000 using Fiberglass RV mobile app
__________________

fofobraselio is offline   Reply With Quote
Old 07-02-2018, 10:17 PM   #2
Senior Member
 
John in Santa Cruz's Avatar
 
Name: John
Trailer: Escape 21, behind an '02 F250 7.3 diesel tug
Mid Left Coast
Posts: 1,807
your trailer is finished with a marine gel coat thats far more durable than any paint.

if the gel coat is damaged beyond where it can be repolished, why not use the same to refinish it ?

high build primers like that are for metal surfaces, not the epoxy base of the gelcoat over fiberglass.
__________________

John in Santa Cruz is offline   Reply With Quote
Old 07-02-2018, 11:15 PM   #3
Senior Member
 
Name: K C
Trailer: 1971 Trailswest Campster
Washington
Posts: 2,524
Quote:
Originally Posted by fofobraselio View Post
Hey friends,
Just wondering if anyone has used duplicolour or other brands of 'high build primer' for priming the exterior before painting, they come in rattle cans, found in the automotive section.

Ill be rolling and tipping with a single part polyurethane paint, on a Boler.

Is there any reason I should NOT be using this product?

Thanks for your thoughts. Attachment 121365

Sent from my ONEPLUS A3000 using Fiberglass RV mobile app
It is always best to use a purpose made primer that was specifically developed for the substrate you are applying it to. Then you should be sure to use a paint that is meant to work with that primer. Your money and your labor have a better guarantee of giving you the best return that way. The goal is to have the best possible adhesion to the substrate and between layers of coatings. Of course nice texture and color when the job is finished is also important. Convenient shopping is not nearly as important as great results. There are high build primers made for some brands of marine urethane paints. Of course you will also get a better job with rolling and tipping or with a professional quality sprayer than you will get with rattle cans.
k corbin is offline   Reply With Quote
Old 07-03-2018, 12:07 AM   #4
Senior Member
 
FRED SMAILES's Avatar
 
Name: Fred
Trailer: 13 ft Boler
Kootenay's of BC
Posts: 827
Registry
I used a different brand rattlecan highbuild in some spot locations, don't remember brand then roll and tipped interlux single stage on my boler.
Was done nov-dec. 2017, towed to Calif and back in winter approx. 4000 miles, pressure washed several times over the course of the last year.
Have experienced zero problems with paint peel etc.
I do agree with previous poster not to paint unless gelcoat is done,,, unless like me, there was no way I was gonna pull a pumpkin and cream coloured boler here behind my red hotrod!!

Fred
Attached Thumbnails
IMG3447.jpg  
FRED SMAILES is online now   Reply With Quote
Old 07-03-2018, 12:11 AM   #5
Senior Member
 
Raspy's Avatar
 
Name: John
Trailer: Black Series HQ19 on order
Smith Valley, Nevada
Posts: 1,653
fofo,

The manufacturer of the polyurethane you choose will have specific recommendations as to the primers and surface prep. Please follow their recommendations.

John, gelcoat is not epoxy base. High build primers are common in the marine industry under Urethane top coats.

The OP plans to roll and tip a single part polyurethane. This is a very good finish and easily the best way to re-coat a fiberglass trailer. There are likely a lot of surface imperfections that the high build can fix in the process.
__________________
I only exaggerate enough to compensate for being taken with a grain of salt.
Raspy is offline   Reply With Quote
Old 07-03-2018, 12:18 AM   #6
Senior Member
 
Raspy's Avatar
 
Name: John
Trailer: Black Series HQ19 on order
Smith Valley, Nevada
Posts: 1,653
Quote:
Originally Posted by FRED SMAILES View Post
there was no way I was gonna pull a pumpkin and cream coloured boler here behind my red hotrod!!

Fred
Hey Fred, is that a Caliente? What are you running in it?
__________________
I only exaggerate enough to compensate for being taken with a grain of salt.
Raspy is offline   Reply With Quote
Old 07-03-2018, 12:34 AM   #7
Senior Member
 
FRED SMAILES's Avatar
 
Name: Fred
Trailer: 13 ft Boler
Kootenay's of BC
Posts: 827
Registry
Quote:
Originally Posted by Raspy View Post
Hey Fred, is that a Caliente? What are you running in it?
yep, 64
Attached Thumbnails
IMG_00000267.jpg  
FRED SMAILES is online now   Reply With Quote
Old 07-03-2018, 12:42 AM   #8
Senior Member
 
Raspy's Avatar
 
Name: John
Trailer: Black Series HQ19 on order
Smith Valley, Nevada
Posts: 1,653
Quote:
Originally Posted by FRED SMAILES View Post
yep, 64

That is very cool. I've wanted one of those for years. Yours is not exactly stock so don't get on it too hard or you might pull the frame right out from under the trailer!!! Love the blower. Excellent TV. Hope to see you at the Boler Rally in Winnipeg.
__________________
I only exaggerate enough to compensate for being taken with a grain of salt.
Raspy is offline   Reply With Quote
Old 07-03-2018, 01:31 AM   #9
Senior Member
 
fofobraselio's Avatar
 
Name: Mark
Trailer: 13' Boler
British Columbia
Posts: 142
Registry
Thanks for chippin' in your opinions fellas.
Ive just read a source that recommends you do not use a urethane paint over a lacquer primer such as the duplicolour mentioned,.as it will not adhere as well in the long run.
From what I have gathered there is 2 options.
Epoxy based primer with its high strength, low shrinkage and great water resistance
OR
Urethane based primer with higher gloss retention and better UV protection.

Seeing as the top coat is urethane based and the boler will be exposed to lots of sun, I will skip the rattle cans (except for stubborn repair spots over body filler) and go with a urethane primer such as Interlux pre kote.

Glad I don't need to tip the primer.
We'll be out camping before you know it.

Thanks again

Research sources:
http://forums.pelicanparts.com/paint...er-primer.html
https://www.sherwin-automotive.com/f...ethane-primers

Paint type:
http://www.pettitpaint.com/products/...poxy-easypoxy/

Sent from my ONEPLUS A3000 using Fiberglass RV mobile app
fofobraselio is offline   Reply With Quote
Old 07-03-2018, 09:47 AM   #10
Junior Member
 
Name: Jane
Trailer: Hunter Compact Jr 1972
Colorado
Posts: 26
Registry
I just this minute finished sanding my Compact Jr and tomorrow will be rolling and tipping the 3rd and final coat of Interlux Brightside. I used 2 coats of Pre-Kote as primer, no thinner in the primer. But I did thin the paint to 10% with 333. Good idea especially if you are experiencing warm temperatures outside. Also, itís best to roll an area no larger then 2 square feet. Get the very best 4Ē foam roller, I used ArroWorthy and had few bubbles. Each coat of paint required ~1quart of paint. Itís not a sprayed on look, but Iím pleased. Iíll try to post photos after I get my pinstripes done. Good luck with your work.
janel is offline   Reply With Quote
Old 07-03-2018, 10:07 AM   #11
Senior Member
 
Raspy's Avatar
 
Name: John
Trailer: Black Series HQ19 on order
Smith Valley, Nevada
Posts: 1,653
Jane,

That sounds like the right way to do it.

It takes some practice to get the rolling and tipping right, as you've noticed. I had a hard time getting it as smooth as I wanted and keeping a wet edge where the next patch ties in. As I went along, there was always some spot I had to leave longer than I wanted to and was beginning to stiffen up. A helper is good and really important for tipping. No stopping until the whole area is done in one sweep. Don't try to fix minor imperfections or remove bugs as you go. Just keep the bigger picture in mind and keep going. The thinning, as you mentioned seems to be the only way to extend the stiffening, but it also thins the coat and makes it run easier. Painting is a real skill that I've never mastered.

Brightside is incredibly UV resistant and glossy. Done right it will last for years. Boats can ply the sea, sit outside and be washed over and over with Brightside hulls.
__________________
I only exaggerate enough to compensate for being taken with a grain of salt.
Raspy is offline   Reply With Quote
Old 07-03-2018, 10:13 AM   #12
Senior Member
 
Name: J Ronald
Trailer: Currently shopping
North Carolina
Posts: 230
Painting

I've used Brightside many times on fiberglass boats. Rolling with a 4" foam roller until the paint is sticky will eliminate any need for tipping and prevent runs and bubbles also. The thicker coat you put on the longer you will need to roll it. Watch your roller closely and do not let it start to break up, change the roller often enough to prevent ir breaking up. Brightside is very forgiving and will level out and brighten up as it cures and shrinks. Definately use the primer Interlux made for Brightside. By the way Gelcoat IS Epoxy, since it is mostly non reinforced epoxy it is not very hard.
J Ron is offline   Reply With Quote
Old 07-03-2018, 10:15 AM   #13
Senior Member
 
Name: J Ronald
Trailer: Currently shopping
North Carolina
Posts: 230
PS Do not wax Brightside. It has Teflon in it that rises to the top and makes it easy to keep clean. Wax will remove the Teflon
J Ron is offline   Reply With Quote
Old 07-03-2018, 10:39 AM   #14
Senior Member
 
Raspy's Avatar
 
Name: John
Trailer: Black Series HQ19 on order
Smith Valley, Nevada
Posts: 1,653
Quote:
Originally Posted by J Ron View Post
By the way Gelcoat IS Epoxy, since it is mostly non reinforced epoxy it is not very hard.
I guess I'm confused. Are you saying that Compact Jrs were made with epoxy gel coat, instead of polyester gel coat, and then built up with polyester resin and glass? Seems unlikely with the cost and adhesion problems.
__________________
I only exaggerate enough to compensate for being taken with a grain of salt.
Raspy is offline   Reply With Quote
Old 07-03-2018, 06:07 PM   #15
Senior Member
 
Name: J Ronald
Trailer: Currently shopping
North Carolina
Posts: 230
Gelcoat

No adhesion problem between polister and epoxy. Once polister cures epoxy must be used to get good adhesion because new polisher will not properly adhere to old polister.
J Ron is offline   Reply With Quote
Old 07-03-2018, 06:13 PM   #16
Senior Member
 
John in Santa Cruz's Avatar
 
Name: John
Trailer: Escape 21, behind an '02 F250 7.3 diesel tug
Mid Left Coast
Posts: 1,807
you mean polyester? cuz I sure don't know what polister is.
John in Santa Cruz is offline   Reply With Quote
Old 07-03-2018, 09:28 PM   #17
Senior Member
 
FRED SMAILES's Avatar
 
Name: Fred
Trailer: 13 ft Boler
Kootenay's of BC
Posts: 827
Registry
Quote:
Originally Posted by J Ron View Post
No adhesion problem between polister and epoxy. Once polister cures epoxy must be used to get good adhesion because new polisher will not properly adhere to old polister.
TOTALLY DISAGREE!!,,!!

Ive never seen delamination of reasonably roughed up old glass and a new glass
application.
FRED SMAILES is online now   Reply With Quote
Old 07-03-2018, 09:51 PM   #18
Senior Member
 
Raspy's Avatar
 
Name: John
Trailer: Black Series HQ19 on order
Smith Valley, Nevada
Posts: 1,653
Quote:
Originally Posted by J Ron View Post
No adhesion problem between polister and epoxy.
No adhesion problem? The general rule is that epoxy sticks to polyester, but polyester does not stick to epoxy and this certainly has held true for the work I have done.

I've also seen a lot of boat repairs where Polyester was used to repair polyester hulls.


I hope you'll provide more information
__________________
I only exaggerate enough to compensate for being taken with a grain of salt.
Raspy is offline   Reply With Quote
Old 07-11-2018, 10:32 AM   #19
Member
 
Name: Gerry
Trailer: Titanium
Alberta
Posts: 42
Lots of good advice here. We spray solvent based polyurethane or acrylic, depending on colour choice. Both have been designed specifically for fibreglass exterior application.
lilcamperpainter is offline   Reply With Quote
Old 07-11-2018, 10:45 AM   #20
Senior Member
 
Kai in Seattle's Avatar
 
Name: Kathleen (Kai: ai as in wait)
Trailer: Amerigo FG-16 1973 "Peanut"
Greater Seattle Metropolitan Area, Washington
Posts: 2,463
Registry
Use products that mention "fiberglass." And you can "just" roll using a foam, closed-end (hot dog) roller if you roll until all the bubbles are out and then let the paint self-level. You don't "HAVE" to "tip." What makes a huge difference is working where there is no dust or floating cottonwood! Use two or more well-rolled out coats (thin) rather than try to do it all in one go. And sand carefully in between coats. You can also wet-sand with very fine sand paper afterwards...

BEST with your project,

Kai
__________________

__________________
Semper ubi sub ubi.
Kai in Seattle is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fiberglass resin, primer and paint questions Johnny M Problem Solving | Owners Helping Owners 7 03-05-2017 09:14 AM
Roll & Tipping Primer? Johnny M Problem Solving | Owners Helping Owners 5 07-09-2015 07:50 AM
What a difference a coat of primer makes! courtney Modifications, Alterations and Updates 15 09-05-2013 08:13 PM
flat black primer Lee Trenholm Care and Feeding of Molded Fiberglass Trailers 10 05-06-2008 10:36 PM
Insurance Primer for Newbies Needed Legacy Posts Problem Solving | Owners Helping Owners 23 06-24-2003 01:54 PM

» Upcoming Events
No events scheduled in
the next 465 days.
» Featured Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 08:41 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
×