I have replaced the caulk in my custom tiled-in shower stall, specifically where the floor meets the walls. I used Polyblend brand; I had the impression this is a good quality caulk, appropriate for the purpose. Also it should match my antique white grout. I am concerned a bit since I found that Home Depot sells this brand; I originally got it from a local tile shop. Does this mean it is a crappy product? Due to the size of the crevice, and its depth, it is curing slowly. I am trying to hurry it up. After it was still soft after a few days, I am using a space heater directed at the seam. After 6 days (website says a day should be enough) it is still soft enough to show the impression of my fingernail. It has skinned over. The opinion has been voiced that the heater will slow down the curing. What do I do??????????