I was helping a little on a job at the skeet club with a HVAC and general contractor today. We were putting in some vent duct. They had a tube of Dap Ultra Clear in the chalking gun. After reading the label and seeing the actual product, I think it might be somewhat superior to the GE silicone I used. If for no other reason it dries clear, if that would be an advantage for anyone. I have no issues with the GE, just letting those know that might want to give it a look.