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Repairing fiberglass cowl - 11/6/2012 12:15 AM   
devil505


 

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Status: offline 		I have a fiberglass cowl that I need to repair. I have the fiberglass cloth but no resin. Do I have to use resign or is there other stuff I can use, thanks

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RE: Repairing fiberglass cowl - 11/6/2012 12:37 AM   
da Rock



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Status: online 		Use 30 minute epoxy with the cloth. No special epoxy needed. Any brand you find in the local hobby shop will work great.

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RE: Repairing fiberglass cowl - 11/6/2012 12:42 AM   
devil505


 

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Status: offline 		Would any 2 part apoxy work. I have some harbor freight stuff that is 2 part.

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RE: Repairing fiberglass cowl - 11/6/2012 12:42 AM   
da Rock



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Status: online 		Nowadays we what we call a fiberglass cowl could be composed of polyester resin and cloth just like when fiberglass parts first showed up, or they could be composed of epoxy resin and cloth. Just looking at a part nowadays, it's pretty much impossible to be sure which resin was used. You can guess by looking at the damage but that's not necessary.

Usually polyester resin won't stick to epoxy very well. Epoxy resin will stick to both itself and the polyester. So to repair without worry, use epoxy.

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RE: Repairing fiberglass cowl - 11/6/2012 12:45 AM   
da Rock



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quote:

ORIGINAL: devil505

Would any 2 part apoxy work. I have some harbor freight stuff that is 2 part.



Yup

However it's best to use at least 30 minute for best wetting, penetration, and strength.

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RE: Repairing fiberglass cowl - 11/6/2012 2:49 AM   
sensei



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Status: online 		Medium CA no kicker and 2-6 oz. cloth works very well for repairs on cowlings and wheel pants, been doing it for years.

Bob

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RE: Repairing fiberglass cowl - 11/6/2012 2:58 AM   
Gray Beard


 

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quote:

ORIGINAL: da Rock

Nowadays we what we call a fiberglass cowl could be composed of polyester resin and cloth just like when fiberglass parts first showed up, or they could be composed of epoxy resin and cloth. Just looking at a part nowadays, it's pretty much impossible to be sure which resin was used. You can guess by looking at the damage but that's not necessary.

Usually polyester resin won't stick to epoxy very well. Epoxy resin will stick to both itself and the polyester. So to repair without worry, use epoxy.

Been there, ran into this!! Also make sure you clean the cowl before you ever try to repair it. I stick them into hot soapy water and scrub them real good, then I clean them with alcohol and acetone. Any oil will keep the epoxy or resin from sticking. Do a test in a small area to make sure it's going to stick.On the outside to hide the cracks I use a Bondo spot filler, easy to sand and it paints well.

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RE: Repairing fiberglass cowl - 11/10/2012 2:47 PM   
kenh3497



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Status: offline 		Polyester resin when you sand it will have a "sweet" smell to it. Epoxy will be odorless for the most part. Getting rid of any oil is essential. Epoxy, IMO, is the preferred resin to use to repair. It sticks to itself and polyester well.

Ken

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RE: Repairing fiberglass cowl - 11/10/2012 5:04 PM   
speedracerntrixie


 

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quote:

ORIGINAL: sensei

Medium CA no kicker and 2-6 oz. cloth works very well for repairs on cowlings and wheel pants, been doing it for years.

Bob



Been doing the same as well. CA works great on either resin system. The only difference is that I will use the CA to glue the peices back together and then add a single layer of 4 oz cloth to the inside. As otheres have stated, getting the part clean before any repair is key



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RE: Repairing fiberglass cowl - 11/11/2012 12:03 PM   
OldScaleGuy



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Status: online 		IMHO, Gray Beard and sensei have the best answers. As clean as you can get it, CA and fiberglass cloth for the repairs. My experience has proven that epoxy does NOT hold well with a part made from polyester resin.

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RE: Repairing fiberglass cowl - 11/11/2012 1:24 PM   
flyinwalenda


 

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Status: online 		Warm up the epoxy a bit and that will thin it out so it can be applied easier. If it is 30min or longer epoxy you can mix about 15% alcohol in it to thin it out too.


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RE: Repairing fiberglass cowl - 11/14/2012 7:27 PM   
acdii


 

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Status: offline 		The cowl for the Eflite T-34 must be polyester then, I used regular Bondo resin and glass to repair it and it is looking good. Stuck very good to it too.

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