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I know this is an old post, but: tricks learned from years of using various caulks....
Urethane caulks (Like Lexel) are easily finger smoothed using mineral spirits after you've taped and run your bead. Remove the tape immediately and lightly go over the bead one more time with that spirits dipped finger.
Silicone, if you must use it for a bead, then it is smoothed with a finger dipped in denatured alcohol. Same tape and second smoothing technique for the best finish.
Latex caulks, these are smoothed using a light spray, and I mean really light mist, of water with dish detergent added. Wet finger, smooth. Pull tape and repeat.
For exterior applications of any type of caulk (windows, doors, etc), I never smooth them but instead have developed the ability to create what mimicks the "dime" look of good welds. This is an advantage to beat the effects of weather upon those seals and really extends the life after application.
Just an observation: newbies tend to cut the tip too small. To mimick the weld bead of dimes, you actually apply from the bottom up on vertical runs.
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Experience is what you get when you don't get what you want.
"We'll be friends until we're old and senile,....then we'll be new friends."
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