glossing a board

does anybody have good advise on glossing a board with eps foam.? all of my boards have only had a sanded finish, and i have no experience with glossing. If you got pics to add, that would be great too

Sand to 220 and use poly gloss.

Ive had bad luck glosssing over RR but decent results with Apex and FGH epoxies.

thanks for the info…
do you tape off, just like as if you were doing hot coat?