Just something I had happen one time, since JB Weld is mentioned. I fixed a motorcycle fairing with JB, used the proper factory touch up spray paint primer etc. some months later the JB area slightly blistered. I was very careful and clean about the whole deal.
So I thought since JB might have metal particles in it that it could have been some kind of galvanic deal? I don't know I know I let it cure a long time. Maybe it was me don't know. Has anyone else had that problem?
