Polyurethane coating before cutting/engraving?

I’ve scoured this forum but can’t find a clear answer.
Is it okay to poly coat my boards before coating or is it toxic/a bad idea for any reason?

I don’t know what your search terms were, but it’s come up several times. I only know because I had asked a similar question once many moons ago. The proofgrade stuff is already precoated, there are similar threads to this one:

You can safely coat it, you must let it fully dry, and make sure what you are using has nothing in it that could damage the laser.


@cmadok is 100% on it. Always listen to her, knows her stuff.

As for search terms if you want to go deeper: Searching for “prefinishing” or “prefinished” should find them.