We just received these picture from Robert A. in Maine. Ten years ago Robert coated the copper copula on the roof of his barn with Permalac. Though the copper was still bright, he thought it was time to add a few more coats for peace of mind. Robert was relieved to find that he wouldn’t have to strip the old coating, a light cleaning with acetone to remove foreign material and he was ready to reapply. Good luck and we’ll talk to you again in 10 years Robert.