I think that #16 has to go on very thin to avoid those bubbles. I've even worked it as it was hardening, using a pin to poke the bubble and press the airbubble out of the seam, which is pretty annoying.
#3 goes a VERY long way. I buy a small can, and can build several sumps from it. I'd bought a small squeeze bottle with a needle applicator, and find that one bottle filled is enough for each project. I think I've built about 7 sumps now and have used less than 2 cans.
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