I have a broken bottle that I tried to repair back in the early to mid 70s. The material of choice was casting resin. I did a lousy job trying to get the pieces to fit flush and would like to dissolve the old casting resin and attempt a better repair. I don't want to scrape it out for fear it will alter the matting surfaces so is there anything that would dissolve the old resin? What would be a good replacement? The bottle was broken after it was dug and cleaned so the edges are pretty good. I'm sure a lot of you would say just pitch it or put the pieces in a box of brokens but it has really nice long bubbles and stretch marks and an iron pontil. Appreciate any help, Jim