polyurethane caulk?

[CrestieCool]

I cannot find Black or brown silicone..but they do have blk and brown polyurethane sealant..would this work?

[Shutter]

I'd stick with 100% silicone, no additives. Most people use GE Silicone II 100% Silicone for Windows & Door, and it should be readily available in black or brown at hardware stores.