Can you apply epoxy over vinyl stickers?

Yes, epoxy works fine over vinyl stickers as long as you have some surface area exposed for the epoxy to grip to, such as wood.

We also recommend applying a coat of Mod Podge over any photos, stickers, and other paper before applying the epoxy. You can find Mod Podge here.

If you have a large vinyl sticker that is covering the entire surface, the epoxy will not stick as the vinyl surface will be too smooth. The epoxy needs a proper surrounding material like wood to grip to.