I just bought top-sheets (transparent plastic, 0.75 mm) at an architecture shop. They really have everything, different colors, materials and every thickness from 0.5mm to 4mm.
The plastics have a shiny surface and I don't know if they will bond to the epoxy.
Do you think I can sand them, so they fit better, or will they lose their transparence? Maybe the epoxy makes it transparent again...
thanks,
karsten
sanded top-sheets for better bond to the epoxy?
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You will have to do something to make the plastic bond with the epoxy. Sanding is the only way I know to make it work. You’ll get a mechanical bond that way.
I would suggest you do a test with a small piece to see if the epoxy will make it clear again. I believe that it will. Cut a small piece and rough up half of it with 60 grit or coarser sand paper. Be sure that no shiny plastic is left. Bond it to a piece of scrap wood with some glass in between like the ski would be, and see how it does. I think you’ll find that the half that is not rough will peel right back off with little effort.
Good luck
I would suggest you do a test with a small piece to see if the epoxy will make it clear again. I believe that it will. Cut a small piece and rough up half of it with 60 grit or coarser sand paper. Be sure that no shiny plastic is left. Bond it to a piece of scrap wood with some glass in between like the ski would be, and see how it does. I think you’ll find that the half that is not rough will peel right back off with little effort.
Good luck
We've tried using polycarbonate as a topsheet but it does not bond very well. We abraded it with 60 grit and it turns clear with the epoxy, however, they quickly delaminated after a couple of days. I think using a hand sander doesn't abrade the plastic enough, sandblasting would probably be better.
-kelvin
-kelvin