WANTED TO BUY! Door for a Tokheim 39 short w/o ad glass. Must be good straight door w/o rust out. Hinged left side. Please contact us at 920-279-1206 with pictures and price or Private Message us. We will be updating our web site 7-19-18 so our normal email: email@example.com may be down for up to 48 hours. Thank you.
I usually don't have any problems with clear coat in general, chalking would be weird in my opinion. BUT I do remember one time years ago when I used a crazy amount of clear over a porcelain sign and I had white discoloration in random locations. Thought I'd have to strip it, but when I let it set for a few months the white cleared up on its own, which was a nice surprise. I haven't cleared a porcelain sign in years though.