Your pickup didn't come with foam in the case? I have a bunch of extra from all the pickups I've bought. I even used a piece of extra with a Velcro cable tie and made one of those wraps for around the strings at the headstock to stop the ringing.
Actually, I just used it because it was cheap and easy to get. The engine enamel doesn't require a clear coat as it would just peel off in a high heat situation. I actually painted my engine the same color as the guitar about a year ago haha