On Friday, June 27, 2014 10:22:36 AM UTC-7, Michael wrote:
I've cut dados into 2 X 4 construction timber frames (lap joints) for polycarbonate sections for a greenhouse-type structure (actually, a solar wood kiln). I'm going to paint the frames before I assemble, but while I'm at Home Depot to get the paint, I going to get some calk to seal the frame (wood to polycarbonate) and I don't know if your basic DAP polymer sealant is going to do the job. I don't know if polycarbonate requires a special product, and I'm guessing the structure is going to get pretty warm in the summer..



Thanks.

Any exterior caulk they sell at the big box store will do the job. Silicon sticks to anything.