Quote Originally Posted by CBratron View Post
The hydrocarbon propellant in spray cans is an excellent solvent and is absorbed by the paint you're coating, thus ruining the finish. Airbrush or brush application should be fine.

In Australia we have very similar products to Future Floor Polish. Pledge One Go, which I get from Bunnings, is one of them.
In the past I have been reluctant of clear coats for that reason. I have tried to spray clear to painted plastic that had been left for weeks to dry only to see the coat of paint be dissolved by clear paint from the same company (Tamiya). From then on I am not sure if it's possible to have even clear coats without a spraying device or having to buy an air brush.