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Fuel Proofing

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Robert Welford11/09/2018 17:15:15
152 forum posts
4 photos

I'm just finishing a Tomboy powered by an Irvine Mills 0.75. I've covered it in Polyspan, doped it with HMG nitrate dope.

My question is: Do I need to fuel proof it, or is nitrate dope fuel resistant to diesel fuel?

Edited By Robert Welford on 11/09/2018 17:45:26

Alan Gorham_11/09/2018 17:57:49
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787 forum posts
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Robert, I remember the old advice from Eric Coates in Aeromodeller was that if you mixed your own fuel with mineral oil then dope needed no extra fuelproofer.

I think with a castor based fuel I prefer a couple of sprayed coats of Aerokote proofer to make the model easier to wipe down. It stops the finish from getting sticky over time.

Peter Miller11/09/2018 18:39:31
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9846 forum posts
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Polyurethane varnish will also be an adequate fuel proofer, especially for diesels

Alan Gorham_11/09/2018 18:42:17
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787 forum posts
92 photos

Doesn't polyurethane yellow over time though? And if Robert has left the Polyspan natural ie white then that looks a bit grim.

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