Fiberglass layers? - RCCanada - Canada Radio Controlled Hobby Forum
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Old 05-03-2015, 09:39 AM   #1
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Fiberglass layers?

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If one wanted to cover with layers of lighter weight FG (as opposed to just one heavier weight) would you lay it on at the time of the wetting process (immediately on top of the first or preceding layer) or would you wait until preceding layer is dry ... then sand as usual and THEN lay down your subsequent payer .... etc etc?

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Old 05-03-2015, 10:20 AM   #2
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Re: Fiberglass layers?

All down at once wet is how we do repairs on Boeing flaps/spoilers.

I did one once by mistake that got the second layer just after the working time of the first layer, so not set by any means but not really wet either. Even clamped down under the vacuum bag that upper layer peeled right off when gripped with a set of duckbills at the corner. Didn't even mark the lower layer while peeling off.

You will never get as good a bond between the layers unless all down wet together.
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Old 05-03-2015, 02:31 PM   #3
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Re: Fiberglass layers?

All in one shot, work best and you will use less resin/ epoxy = lighter. good luck. Maddog
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Old 05-03-2015, 02:44 PM   #4
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Re: Fiberglass layers?

Totally agree, all one shot. It can be done separately, but you're going to need a rough texture on the first layer for proper bonding meaning a pretty wet coat. The issue with that is you still risk it delaminating as David said and it's going to be more weight as Brad said. The only benefit is more working time on a given layer. So given two cons to one pro, it becomes a no brainer to do it all at once.
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Old 05-03-2015, 02:51 PM   #5
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Re: Fiberglass layers?

Answer kinda depends why you don't you some heavier fiberglass cloth. Pretty cheap at GH. What are you fiberglassing?

The strength of the fiberglass cloth comes from the thickness of the strands. I you use 2 layers of 1 oz cloth you will only get the strength of 1 oz cloth. If you use 2 oz cloth then you will get the strength of 2 oz cloth.

Light weight cloth such 1 0z or lighter is just used on balsa to give the paint a base. It realy doesn't add much strength.

Last edited by Mike Sebastien; 05-03-2015 at 02:58 PM.
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