I used GE 1200 with great results. When it comes to prepping the seams to be sealed, make sure your scrape them down, and then use something to clean them further. I used acetone to clean all my edges, might not be the best stuff, but it worked. Once you're ready, make sure you use masking tape on all the seams back 1/2" or so from the edges, run your bead, smooth it out, and then rip the tape off. It will give you a clean looking job.
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