Will polyurethane stick to vinyl?
Also, can you put clear coat over vinyl?
Vinyl graphics are much less expensive and can be applied by anyone. To keep the vinyl graphics looking good and to keep them protected, they can be sprayed with clearcoat paint. The clearcoat paint keeps the vinyl from peeling and makes the surface easier to keep clean.
Thereof, can you seal over vinyl?
There are three ways that you can seal craft projects, including those with vinyl. Those are a spray sealer like polyurethane polyacrylic spray, dishwasher safe Mod Podge, or an epoxy. With a tray like this with vinyl on it, I would definitely recommend doing an epoxy resin. and pour it over your tray.
Applying varnish over stickers will seal them in the wood surface for years to come. Once you have the sticker covered with a light layer of varnish, let the surface dry for 30 minutes to an hour. If you can still feel the edges of the stickers, apply another thin layer of varnish.