Hi. I need to replace the caulk seam where my acrylic whirlpool tub rim meets the ceramic tile platform which it rests on(around the "rim" of the tub). Currently, the gap is at it's widest when the tub is empty, and when I step in, it is 1/16 inch narrower, because of the weight. Am I correct to assume that in this case, the caulk should be applied with the tub empty? Advice appreciated!