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Need a fuel proof sealing coat

Old 02-25-2021, 08:49 AM
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smilam
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Default Need a fuel proof sealing coat

I am in the process of painting two airplanes and have a question on a sealing clear coat. I sprayed both of them with Rust-Oleum 2X color coat. One of the planes will have a gas engine so it sounds like the Rust-Oleum clear coat will work from what I have read. The second airplane will have a glow engine and I tested the Rust-Oleum clear spray with 15 percent glow fuel and it failed. What kind of sealing coat can I use over the Rust-Oleum color coat that will protect the paint job from glow fuel?
Thanks Steve
Old 02-25-2021, 09:18 AM
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Hydro Junkie
 
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I've used PPG automotive two part clears with 50% nitro with no issues on my scale hydroplanes but you would have to test it to see if it will work with Rust-Oleum
Old 02-25-2021, 11:14 AM
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Truckracer
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Solvent based traditional automotive 2 part clears will not go over Rust-Oleum well as they can cause wrinkling. Your best bet is probably an automotive 2 part, water based clear as it will easily go over the Rust-Oleum and will stand nitro well in excess of 15%. It is very expensive though and only available in automotive finish outlets.

An alternative is water based, single part urethane clears such as those available in home supply places. Brands such as Varathane, MinWax, etc. These will offer reasonable protection against nitro, are readily available, are water clear and go on easily.
Old 02-25-2021, 12:30 PM
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scale only 4 me
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Water based and fuel proof,, comes in gloss also.



C
Old 02-25-2021, 04:28 PM
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smilam
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I think I will make a trip to hardware store tomorrow and get some urethane. I thought I might have some in the basement but it was Minwax sanding sealer and a can of wood hardener which I have used before to strengthen some soft balsa. I have an
airbrush that I have never perfected using and a paint sprayer that I got from my dad over 30 years ago and have never used. I hope the urethane can go on with a brush. Will that work or do I really need to suck it up and use the airbrush and hope for the best?
Steve
Old 02-25-2021, 05:03 PM
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scale only 4 me
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if it can be thinned properly it can be sprayed with an airbrush
Old 02-25-2021, 08:39 PM
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KlassKote
Old 02-28-2021, 06:48 AM
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DGrant
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I didn't have a great experience with Rustoleum on my gassers. One drop of gas will permanently etch the finish even if wiped off immediately. From there if there's Rustoleum clear coat on top, the gas goes right through to the color.

Next time I will bite the bullet and use automotive grade base coat w/2-part clear coat.

For time being I'm trying Dupli-Color type of rattle can, which is apparently a lacquer base. Word is it's a bit more durable than Rustoleum enamels. It's an automotive touch up product found at most auto parts stores. We'll see, but I'll never use Rustoleum on any fuel powered plane again.
Old 02-28-2021, 02:07 PM
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When using Rustoleum, I only use the “Professional” High Performance Enamel that is easily identified on the store shelves because it only comes in the tall spray cans. I started using it some years ago to touch up repaired areas on race car frames. Dries much quicker than regular Rustoleum spray and it is very resistant to gasoline. It was even more durable than the original powder coating on the frames. This paint can be top coated with solvent based clears when thoroughly cured. Only down side I could see was slightly reduced gloss than the regular spray and there was a smaller color selection.

Overall my paint of choice is Klass Kote. When clear topcoats are necessary, automotive 2 part urethane is the choice. Neither of these are really compatible with a spray can enamel like regular Rustoleum.
Old 02-28-2021, 03:25 PM
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That's great information Truckracer. Thank you!!

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