What Mike, Jeff and Dave said. The other thing I do when engraving the lid, is to attach a short piece of fuel line tubing to the latch post that extends down thru a hole on my wood engraving block. This prevents a %$#@ show when removing the lid from the Bondo. Same goes for any screw holes, I use a small piece of tape to cover to keep the Bondo from getting places I don't want it.