How does one remove Fuel proffing?
 

This may be too easy but I was sitting down to work on a repair on my Right Flyer Trainer. I wanted to work on the firewall and forgot previously to ask a seemingly obvious question. I don't know what was originally used to fuel proof since my plane is an ARF, but any suggestions on removal so I can epoxy replacement A/C plywood parts will be helpful.
Thanx! Ron

RE: How does one remove Fuel proffing?
 

Sandpaper.

RE: How does one remove Fuel proffing?
 

Check the firewall to see if it is "glossy" or has a finish on it. MANY ARFs come through WITHOUT any fuel proofing on the firewall. If it has a finish or is glossy, use sandpaper to remove it. A couple of good fuel proofing surfaces are: Dilute some epoxy with about 30% (by volume) of acetone, mix it well and brush on and let dry. Use clear AeroGloss Brand dope, or any dope that states it is fuel proof.

I prefer the epoxy/acetone method even though it takes 24 - 48 hours to dry.

RE: How does one remove Fuel proffing?
 

Just gouge the area with a file or even a razor blade to give the epoxy something to stick to. For larger areas, you could even drill a few small holes part way into the wood.

RE: How does one remove Fuel proffing?
 

Or really coarse sand paper. Rough it up really good so the epoxy will stick. Beef it up with triangle stock if needed.

RE: How does one remove Fuel proffing?
 

Thanks to all for the help. I put in some hours in this weekend and the Right Flyer is almost ready to return from the "Rework Facility" and check flight..