Screw holes? - Page 2 - Fiberglass RV


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Old 02-25-2011, 10:37 PM   #15
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[QUOTE=Matt in SV;238343]
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Originally Posted by peterh View Post
FYI: Polyester gelcoat won't bond to epoxy chemically. Maybe if you rough it up a bit you can get a mechanical bond, and the patch will stick enough to the surrounding Gelcoat to hold it on.
It's actually the other way around: Gelcoat and polyester resins won't chemically bond to epoxy, but epoxy can chemically bind to gelcoat and polyester. What epoxy doesn't stick to, however, is the waxy top layer on the gelcoat. If you remove that with MEK (Methyl-Ethyl-Keytone, a solvent available in the paint department . . . remember to wear chemically resistant gloves) removes any wax from the area and gives the epoxy something to hold on to.
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Old 02-26-2011, 07:46 AM   #16
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Replacing Snap-caps and rings

Mark,
I just bought the Casita Snap-covers and their accompanying rings. If I'm leaving the origingal rivets in (not drilling them out and replacing them), what do I use to stick (bond) the rings to the gelcoat so that the snap caps will snap on and won't leave ANY room for water to get into the trailer?
I not only want the new caps to look good (the old oxidized snap caps are almost wasted away), but also want the new ones to stay on and protect my trailer from ANY water leakage.
Thanks,
BB
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Old 02-26-2011, 01:49 PM   #17
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I was so excited to learn this important thing about silicone from this thread, as I'm in pittsburgh this weekend working with my dad on the Burro. I decided to have a look-see around some seams and cracks and stuff...and discovered that either the previous or the previous-to-the-previous owner had a party with silicone sealant ALL OVER the trailer. Sad blue face.
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Old 02-26-2011, 08:23 PM   #18
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Smile

Purchased the epoxy paste today to fill the old holes durring door repair.

Just need some good weather to go at all the little projects
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Old 02-27-2011, 11:00 AM   #19
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Purchased the epoxy paste today to fill the old holes durring door repair.

Just need some good weather to go at all the little projects
Where did you purchase this epoxy paste? I'm not sure if I can find a Canadian source for the other products mentioned in this thread.

Thanks Karen
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Old 02-27-2011, 11:07 AM   #20
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Fullfords hardware down town Owen Sound, Ontario. He has more on the shelf.

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Where did you purchase this epoxy paste? I'm not sure if I can find a Canadian source for the other products mentioned in this thread.

Thanks Karen
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Old 03-03-2011, 07:55 AM   #21
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I have a number of snap caps to replace also.

Called Casita, and talked to a tech rep. He said to drill out the rivit and replace it with the snap cap base in place. I said, I would rather not replace the rivits if possible. He said the only other solution would be to just stick a new snap cap down over the rivit with silicone.

I told him about the concerns of using silicone on fiberglass and
He said that Casita uses 100% silicone all over the trailer.

My Casita's previous owner(s) replaced many caps using silicone. Some of them popped off when I washed the trailer. Strangely the silicone stayed stuck to the rivit but not inside the snapcap. Silicone is not really a glue, It is more of a sealer of cracks and/or a gasket. If applied correctly, it will do its job and stay in place.

If we think about it, most gaskets don't really stick to parts. They are squeezed between the parts so that liquids/air won't pass through.

I'm working on a solution that has promise, without having to replace the rivit. If it works, I will post the proceedure.

Kip
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Old 03-03-2011, 08:30 AM   #22
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You should read a topic going on the CasitaForum about a poor guy trying to remove yards of silicone he used trying to seal the gap between the awning and the trailer. Silicone is a temporary fix, which can turn into a "permanent" problem. Kip, I'll be following your found procedure with great interest.

BTW: I'd also paint snap caps with Vusion before installing. May as well get as much life out of the caps as possible, UVs are the culprit!
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Old 03-03-2011, 11:13 AM   #23
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Wow. I would not want to pay what they are charging for a new Casita, only to have to go through a series of intensive silicone scrapings and re-sealings within a few years.

I just got through de-silicone-ing most of the small items on my trailer. I was removing, thoroughly cleaning and re-attaching everything with butyl. Three days of hard labor and soreness. However, I noticed many things seemed originally well-attached with butyl and not leaking after 23 years.

Now I have ordered a moisture meter and will test remaining items with a hose for leaks before removing anything else. It seems someone just gooped everything with silicone indiscriminately. I've still got four windows and a couple of running lights to de-goop around the edges, and the tail lights are so fouled they need to be replaced.
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Old 03-03-2011, 11:48 AM   #24
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Quote:
Originally Posted by bbuehler View Post
Mark,
I just bought the Casita Snap-covers and their accompanying rings. If I'm leaving the origingal rivets in (not drilling them out and replacing them), what do I use to stick (bond) the rings to the gelcoat so that the snap caps will snap on and won't leave ANY room for water to get into the trailer?
Hummm - not sure what the point of this would be - other than to make the snaps look better. As far as I know the rivets are the only real means of holding the rings in place. IMHO it would probable not do much to pervent future leaks from happening if the rings where just held on with some bonding material. With the movement of the trailer over time its not out of the norm for some of the rivets to have actually broken off and it may not always be clear from looking at them that they have. IMHO it really is a better idea and money saver in the long term to drill out and replace the rivets at the same time. Not really that hard to do.
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Old 03-04-2011, 08:04 AM   #25
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Quote:
Originally Posted by Donna D. View Post
You should read a topic going on the CasitaForum about a poor guy trying to remove yards of silicone he used trying to seal the gap between the awning and the trailer. Silicone is a temporary fix, which can turn into a "permanent" problem. Kip, I'll be following your found procedure with great interest.

BTW: I'd also paint snap caps with Vusion before installing. May as well get as much life out of the caps as possible, UVs are the culprit!

"You should read a topic going on the CasitaForum about a poor guy trying to remove yards of silicone he used trying to seal the gap between the awning and the trailer."

Donna, I got into the same type problem removing silicone, where the previous owner(s) continued attempting to "seal" around the fantastic fan.
As it turned out, there was no gasket between the fan base and the roof.
Fantastic fan sent me a new gasket FREE!
Once I was able to seperate the fan assemble from the roof, the silicone scraped of the roof fairly easily, but was a real pain to remove from the fan base. Had to use a product that disolved the silicone.

I fully understand that simply applying silicone or any other "sealer" will usually not seal as well as a new gasket would. But there are times when a touch of sealer will fill a small gap and work great.

"Silicone is a temporary fix, which can turn into a "permanent" problem."

In cases where a dab of sealer is necessary, what product have you found to be more effective and permenant than silicone? Preferably something that is white or clear, so it will blend.

Kip, I'll be following your found procedure with great interest.

Got into it yesterday and tried a couple of ideas that
did not work. Of course, failure is part of a learning curve.

More to follow, as one idea at a time is shot down. Trial and error, trial and error.

Thanks,
Kip
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Old 03-04-2011, 11:06 AM   #26
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3M makes marine sealants 4000 and 5000 series, available at boat supply places. These places also have other sealants that are made for fiberglass. White is the most common color. I got a polyether sealant from West Marine that comes in black and white.

When you scrape silicone off, you can see why it is not good for fiberglass. Most of the bead is more stuck to itself than the trailer, and peels off fairly easily. Then patches of a thin layer of silicone, inadequate to seal anything, remain stuck to the trailer so hard that you have to damage or almost damage the surface to get them off.
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Old 03-04-2011, 12:02 PM   #27
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............what product have you found to be more effective and permenant than silicone?....................
Kip
As Ken wrote 5200 and 4200 polyurethane sealants/adhesives are permanent and will work under water. Removal is much more difficult than silicone.
3M

George.
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Old 03-05-2011, 06:12 AM   #28
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Hey, thanks guys. This 3m 5200 series sealer (06535) looks interesting.

Now the obvious questions:

1. How well does it stick to clean fiberglass?

2. How well does it stick to plastics.

3. How well does it stick to metals.

I know this seems like redundant questions. But I'm thinking of some other applications as well as the snap caps. For instance a sealant to
stick curtain rod hangers to the bottom of the overhead cabinets in the Casita, and a couple of more ideas.

Thanks for any help,
Kip
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