I have a white Tele pickguard now totally filled with autographs (in black, green, blue, & red Sharpie ink). I want to protect it b4 putting it back on. What is the best way to do this without ever damaging the signatures? I thought I would put on many coats of a clear spray, but was told the solvents will cause damage. I thought a clear mylar w/adhesive would work, but was told the adhesive could eventually react with the ink. Ideally, I would like to get a clear, very thin, stiff, flat piece of plastic and have someone professionally cut it to fit, but I would need to find flat head screws (not the countersunk originals) to hold it on so its completely flat w/no warping/buckling around the edges. Has anyone ever done this and do you have any advice? Thanks.