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Fibreglass Repair ... a few questions on materials and technique

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Alberta Mike

04-07-2002 15:05:00




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I'm repairing a fibreglass engine cover for a friend of mine. Something fell on it and gave it a pretty good bash. The repair area isn't too big but the housing is smashed with a lot of that fibrestrand stuff sticking out of the worst part, and some cracking away from that area. I've worked with fibreglass before and what I want to do is start on the inside with a patch of mat and resin, then later move to the outside, get rid of some of the loose stuff, and then lay in mat and resin in successive layers. Finally, I'll use a little surface filler (Bondo) and finish it up. My questions are: (1) Am I going about this correctly? (2) Should I be using the woven mat or the random-strand mat? I was thinking maybe the woven mat on the inside for maximum strength, then the random-strand stuff on the outside since I find it a bit more forgiving to work with.

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sammy the RED

04-08-2002 16:49:50




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 Re: Fibreglass Repair ... a few questions on materials and technique in reply to Alberta Mike, 04-07-2002 15:05:00  
Dont use Bondo. Use Ever Coat instead. It sands alot better.



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Fergus Dingle

04-07-2002 20:11:51




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 Re: Fibreglass Repair ... a few questions on materials and technique in reply to Alberta Mike, 04-07-2002 15:05:00  
Tell him to buy a Hixton Prarie Dominator!!! No fiberglass, just good old Canadian iron and steel!



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TractorNut

04-07-2002 17:57:47




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 Re: Fibreglass Repair ... a few questions on materials and technique in reply to Alberta Mike, 04-07-2002 15:05:00  
You have the basics down pretty good. Just a couple things that might be helpful. Be sure to relieve all the stresses in the piece by allowing the broken pieces to match back up. Take a hacksaw blade and saw up through any broken areas to allow the pieces to relax. As you probably know, the woven fiberglass WILL show the pattern through the finish after some time, so if I use it, I only use it as a backer. After the application and drying of the backing layers, V cut the front a couple inches wide and apply the random strand. Be sure to roll out as much of the resin as possible with each layer as the fiberglas is the strength not the resin. There are special small serrated rollers for this. Dip them in acetone first to keep it from attaching to your fiberglas/resin. Roll out the resin, pressing the random stands together. Grind it off leaving a little depth for the finish filler.
As you probably know fiberglassing is easy with a few basics.

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