1st Project in FB - looking for options on molding tail light

Like the topic says. I’m going to try and make a tail light overlay on a Dodge neon. I think I have read some where, that you can use tin foil to cover the area so the FB will not get onto the paint. I was thinking of putting down a layer of thick plastic and then covering that witrh tape, then putting down some foil over that. Basicly, I do not want to get the resin on my light or esp. the paint.

I could take the light out, but the idea I have covers part of the seem on one end of the light. Any sujestions?

k. thanks.