I am now on my third recaulking of the year, and this time, I am determined to get it right. Amazon has provided the fresh caulk, I think I already have the skillz, and now I get this tidbit of stunningly obvious instruction:
NOTE: The most common error in tub re-caulking is failure to fill the tub first. Water weighs 8 pounds per gallon. When the tub is full of 8-pound gallons, plus your own weight, the bathtub flexes, dropping down and away from the wall and pulling the joint open. Caulking the joint when it's as wide open as it can ever possibly be, makes your fresh caulk job last way, way longer.