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Ok here's a crazy idea. Has anyone ever tried putting clear polyurethane, like you put on furniture, on a car? I redid a table and it smooths out perfece and is high gloss.

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The minwax polyurathane would tend to be soft. That is just the nature of that coating. I have several items of furniture that were minwaxed and then give a clear polyurathane finish. That was over five years ago...

I can still do the thumbnail indent in that finish. It just never hardens to the point where it is hard enough to trust on the outside of a car body. It would pick up ever little scratch and present problems when you try to wax or polish it.

Now... possibly if the polyurathane clear coat was being cut and applied as thinly as the polyurathane paint and thinner... it might harden in a way simalar to the paint.

I am not sure that difference is with the polyurathane paint as compared to the clear polyurathane coating... but I can safely say that the polyurathane paint will dry hard enough to equal an enamel sprayed paint job.

Even furniture finishers tend to swing over to clear coat acrylics to get a truly hardened surface. And although acyrlic can be used on high traffic floor areas etc... it still needs maintenance to keep the clear coat acrylic finish shiny and scrach free. But even the acrylic clearcoats are mostly used for interior use and I don't know how it would stand up to long term exposure to sun, uv, heat or water...

Possibly an experimenter might want to try to mix some Viagra in with the clear coat polyurathane or clear coat acryllic to see if it makes it harder and last longer

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