You Can Repair Fiberglass - Page 10 - Fiberglass RV


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Old 05-03-2015, 05:54 PM   #127
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In general, does fiberglass resin stick to Bondo?


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Old 05-03-2015, 10:13 PM   #128
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In general, does fiberglass resin stick to Bondo?


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Like brown stuff to a blanket!,,, if prepped properly.
fred
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Old 05-03-2015, 10:32 PM   #129
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Great thanks! Wait, Like brown on a blanket? Is that good? ;0)


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Old 05-03-2015, 11:05 PM   #130
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Okay, so I have decided not to go back with the roof top a/c reinstalled, but I still have to fix the roof sag and do some other fiberglass repairs...now this may be a dump question but is fiberglass mat and 2 part epoxy repair water proof? I was thinking I could sand it, prime it & paint it, but I was told that is was not water proof but that it is porous and water could seep through...knowing that fiberglass molds are gel coated, should I gel coat over the repaired areas? Or is there another product to seal it with? Someone suggested an automotive protective coat of some kind? If I do get coat, is it hard to do, and is it expensive?
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Old 05-04-2015, 05:44 AM   #131
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Wait, Like brown on a blanket? Is that good?
Yes, that is as good as sticking gets. Bondo and other body fillers are just fiberglass (polyester) resin with filler powders pre-mixed in them.

One of the mysteries of the world, at least to traditional engineering types here in Britain, is how come in different circumstances brown stuff has both the highest and lowest known coefficients of friction:
- "sticks like **** to a blanket" is indeed as sticky as it is possible to be;
- "slides like red hot **** off a white hot shovel" is as slippery as it is possible to be (you should hear a hissing sound in your mind as you read those words, if you have any mechanical sympathy). Pucks of solid carbon dioxide are quite sticky by comparison.

It has never been entirely clear to me why anyone would have red hot **** on their white hot shovel frequently enough to know its coefficient of friction, but I suspect this may have been the drivers and firemen of steam locomotives who did not have any other toilet in the cab.

That may have been more than you wanted to know.....
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Old 05-04-2015, 08:31 AM   #132
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Okay, so I have decided not to go back with the roof top a/c reinstalled, but I still have to fix the roof sag and do some other fiberglass repairs...now this may be a dump question but is fiberglass mat and 2 part epoxy repair water proof? I was thinking I could sand it, prime it & paint it, but I was told that is was not water proof but that it is porous and water could seep through...knowing that fiberglass molds are gel coated, should I gel coat over the repaired areas? Or is there another product to seal it with? Someone suggested an automotive protective coat of some kind? If I do get coat, is it hard to do, and is it expensive?
Don't waste your money on epoxy...follow the instructions on this thread...wear protective gear, clean, sand with around 100 grit, fiberglass with mat and polyester resin, sand, clean, bondo, sand clean, prime, paint.
Easy, cheap. lifelong lasting and you can do it. Fiberglass Dave
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Old 05-04-2015, 11:04 AM   #133
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Don't waste your money on epoxy...follow the instructions on this thread...wear protective gear, clean, sand with around 100 grit, fiberglass with mat and polyester resin, sand, clean, bondo, sand clean, prime, paint.
Easy, cheap. lifelong lasting and you can do it. Fiberglass Dave
Okay DW, I am using the mat (Bondo brand) and this is what I am using with it: Bondo Fiberglass Resin - comes with a tube of hardener (see picture)...I don't see where it says if it is polyester on the container, is this what you are talking about? I used this stuff on a crack on my boat a few years ago and worked well, was water tight.
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Old 05-04-2015, 11:57 AM   #134
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That certainly looks like polyester resin and if the 'hardener' (catalyst) comes in a small tube, then that confirms it.

If you are trying to apply it overhead, there is a trick you can use. Get some moderately heavy plastic and wet out the glass mat on top of a strip of the plastic. Then lift the plastic-glass combo into place and press up - you need to slowly peel the plastic off, stippling the glass into place as you go, before the resin sets, but that is waay easier than trying to wet out glass overhead!
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Old 05-04-2015, 01:42 PM   #135
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This stuff is available from most boat shops. West Marine is the one in this link. Essentially silica dust that is mixed with resin to thicken it. The silica goes a long way toward making the stuff easier to work with on vertical or overhead horizontal surfaces.

WEST SYSTEM #406 Colloidal Silica | West Marine

One can also purchase short cut fibers and used with the silica can get resin to the consistency of peanut butter for filling corners beads when tabbing something in.
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Old 05-04-2015, 03:00 PM   #136
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Okay DW, I am using the mat (Bondo brand) and this is what I am using with it: Bondo Fiberglass Resin - comes with a tube of hardener (see picture)...I don't see where it says if it is polyester on the container, is this what you are talking about? I used this stuff on a crack on my boat a few years ago and worked well, was water tight.

Excellent....easy to find, easy to use, easy to give you a professional repair....GO TO IT!
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Old 05-06-2015, 11:08 PM   #137
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Okay, next question(s) for Fiberglass Dave, after my fiberglass repair/patching, what specifically to you recommend for a filler? Any particular brands? I have heard that Bondo brand filler dries too hard for sanding/shaping and can break off around the edges...

I am also replacing the upper dinette floor and forward upper floor under front bunk area due to hidden rot in plywood. I have the Boler off the frame and cut out the front floor flush to the edge of the body leaving the fiberglass layer underneath the old wood in place so the new plywood has something to rest on. Then I coated the old lower glass with polyester resin, placed the new wood in place and then glassed the top side to the body. Tomorrow I will begin to glass in the bottom side to the body/shell. Should I leave the old lower glass in place and glass over it again? I went with untreated plywood for the floor because I was unsure if the polyester resin would adhere to pressure treated plywood so I plan to put a complete layer of mat/polyester resin to the underside of the wood to protect it from the elements. I plan to do the same for the rear floor. I carefully cut the old floor out and used it as a template to cut the new floor. I will post some pics when I have a chance. Where is a good place to buy mat, resin and filler in bulk at an economical price?

Also I know I would love to see a tutorial on your filler/finishing work similar to your fiberglass tutorials (specifically techniques on blending filler to existing gel coat and contouring the filler to the existing body shapes)...
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Old 05-07-2015, 09:01 AM   #138
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Okay, next question(s) for Fiberglass Dave, after my fiberglass repair/patching, what specifically to you recommend for a filler? Any particular brands? I have heard that Bondo brand filler dries too hard for sanding/shaping and can break off around the edges...

I am also replacing the upper dinette floor and forward upper floor under front bunk area due to hidden rot in plywood. I have the Boler off the frame and cut out the front floor flush to the edge of the body leaving the fiberglass layer underneath the old wood in place so the new plywood has something to rest on. Then I coated the old lower glass with polyester resin, placed the new wood in place and then glassed the top side to the body. Tomorrow I will begin to glass in the bottom side to the body/shell. Should I leave the old lower glass in place and glass over it again? I went with untreated plywood for the floor because I was unsure if the polyester resin would adhere to pressure treated plywood so I plan to put a complete layer of mat/polyester resin to the underside of the wood to protect it from the elements. I plan to do the same for the rear floor. I carefully cut the old floor out and used it as a template to cut the new floor. I will post some pics when I have a chance. Where is a good place to buy mat, resin and filler in bulk at an economical price?

Also I know I would love to see a tutorial on your filler/finishing work similar to your fiberglass tutorials (specifically techniques on blending filler to existing gel coat and contouring the filler to the existing body shapes)...
I don't get into brands because Bondo brand is the most available and is ok. This entire thread is about repairing these trailers at home, easily with readily available materials. Used properly, any will work, some better and easier than others. We like Evercoat products for fillers. For your repairs, however you choose to do them, just follow the main rules...wear safety stuff, always sand and clean/dry all surfaces before applying the next step and it will work.

I had wanted to do a bondo, prime, paint thread but I ran into a problem with this thread that really isn't a problem, but is just really the nature of forums. Although I am not an expert at anything, I have owned a fiberglass shop for 39 years. It seems that when a question is asked of the author of a thread, it is answered by many people who may or usually do not know the answer to the question. These experts that chime in for the author of the thread really should start their own thread. Instead they spread misinformation that waters down the original thread and has, in many cases with this one, stopped people from trying. However, I know more people have been helped than not. I am always available by PM and help many people on a personal level this way. I have not figured out a way to solve this problem, so until I do, I won't be doing anymore self help threads, just helping by private message. Thanks...Fiberglass Dave
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Old 05-07-2015, 10:35 AM   #139
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That's kind of a shame Dave. I really appreciate this thread. I am sure I would find a Bondo thread just as valuable, since that is one of my chosen jobs this summer.

I have learned to take what people post with a grain of salt. I apologize for being one of the those who will chime in.
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Old 05-12-2015, 04:17 PM   #140
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Thanks Dave - You advice was very valuable to me and I appreciate what you gave.

Best,
Davie

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I don't get into brands because Bondo brand is the most available and is ok. This entire thread is about repairing these trailers at home, easily with readily available materials. Used properly, any will work, some better and easier than others. We like Evercoat products for fillers. For your repairs, however you choose to do them, just follow the main rules...wear safety stuff, always sand and clean/dry all surfaces before applying the next step and it will work.

I had wanted to do a bondo, prime, paint thread but I ran into a problem with this thread that really isn't a problem, but is just really the nature of forums. Although I am not an expert at anything, I have owned a fiberglass shop for 39 years. It seems that when a question is asked of the author of a thread, it is answered by many people who may or usually do not know the answer to the question. These experts that chime in for the author of the thread really should start their own thread. Instead they spread misinformation that waters down the original thread and has, in many cases with this one, stopped people from trying. However, I know more people have been helped than not. I am always available by PM and help many people on a personal level this way. I have not figured out a way to solve this problem, so until I do, I won't be doing anymore self help threads, just helping by private message. Thanks...Fiberglass Dave
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