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Author Topic: Is it necessary to fuel proof Polyspan on a 1/2A FF  (Read 345 times)
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wmazz
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« on: December 19, 2018, 04:40:19 AM »

I have read about people that have used fuel proof dope on Polyspan
and I have read warnings against using butyrate dope because it will
peel off?

Isn't Polyspan fuel proof without anything applied to the surface.

Bill M.
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billdennis747
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« Reply #1 on: December 19, 2018, 05:10:38 AM »

Isn't it the finish itself that needs proofing, not the 'polyspan'?
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flydean1
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« Reply #2 on: December 19, 2018, 08:29:29 AM »

I think Bill has it right.  I've yet to use it myself, though I have a bunch in stock.
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Starduster
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« Reply #3 on: December 19, 2018, 09:07:11 AM »

I have read about people that have used fuel proof dope on Polyspan
and I have read warnings against using butyrate dope because it will
peel off?

Isn't Polyspan fuel proof without anything applied to the surface.

Bill M.


Pretty easy to test, though... attach a square of Polyspan to a small frame and then dribble some high-nitro fuel on it and see what happens...
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Konrad
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« Reply #4 on: December 19, 2018, 09:51:02 AM »

Isn't Polyspan porous! As I think it is, it not classically fuel proof as it does not protect the wood from being oil soaked. One needs to seal the weave, nitrate dope is fine for this. Nitrate dope also provides the teeth needed to allow fuel proof* butyrate dope to be applied.  Do not apply butyrate dope in thick layers as it will blister (pull away) from concave surfaces as it dries (shrinks). I like to air brush on butyrate dope and brush on the nitrate dope.

*Butyrate dope is fuel proof to a little bit above %15 nitro. It will not hold up to %65 nitro.
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