There are many places where one can purchase a top coat. One can purchase a top coat at popular stores such as Jos A. Bank, Burberry, J. Crew, and Lands' End.
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Ïf you don't use base coat the top might either not stick properly, or it might not cover properly. If you put the base coat on the top coat you won't get the gloss and maybe not even the color that you intended.
Permanizer is the best one coat paint that is made by PPG Porter Paints.
Not Yet, But you can use a heatproof top coat to seal and protect a normal plastic coat below it, try Krylon Fusion for the plastic, and VHT Heatproof
It will work over another latex paint, however it won't be as scrubable as a normal top coat, and it won't adhere as well as a paint over a primer. Better to apply the primer, then the paint. If the surface is clean and deglossed though, you really don't need a primer and can coat the surface with a quality wall paint.
I am actually getting ready to try this myself... I talked to someone at Lowe's and they reccommened a really thick polyurethane product they carried. One coat was equivalent to 30 coats of the normal kind. I hope it works! I am ready to try it.