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Polyurethane clear coat

Old 06-17-07, 12:10 PM
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ajd
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Polyurethane clear coat

I'm rattlecanning an old bike for errands-riding, and want to clearcoat it soon. I've read a lot of the threads here and on other boards about bike painting -- thanks, folks, some really good ideas and some pretty wacky ones -- but nobody's mentioned using household outdoor-grade polyurethane for a clearcoat.

It comes in all styles from the hardware store, is always sold for woodworking, and the glossy kinds are even available in spraycans.

Has anybody tried this? I assume it's not the same material as the urethanes used in paints for metal surfaces, but I wonder if it will do the job.

Shininess, fading and discoloring are things I don't care about.
Chipping and scuffing are things I do care about.
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Old 06-17-07, 05:24 PM
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tellyho
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Judging by the results on the table I use on my porch (polyurethaned last year and looking like hell this year), I'd stick with the clearcoat at your auto parts store. It should be $7 at most.
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Old 06-17-07, 05:28 PM
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Oh, and my experience with the rattlecan is that the clearcoat doesn't make a bit of difference in protection. Unless you cleaned the hell out of the frame to begin with, it's the adhesion of the paint to the metal that will fail. As you can tell, I'm bitter about the finish on my fixed gear.
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Old 06-18-07, 04:20 AM
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How is polyurethane for scuff-resistance? Most spraycan jobs I know of get wear spots eventually.
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Old 06-18-07, 06:54 AM
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The only thing it will give you is more layers of whatever in between the world and your frame. But if your first layer of paint doesn't stick particularly well, this won't matter.

Which really means, "I have no idea".
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