Finished up the process today but my tank was very difficult to get the sealer out of - the fill tube sticks into the tank about 2 inches and the outflow isn't at a low point (go figure...).  So, I went to Tap Plastics and purchased 6' of 1/2 acrylic tubing for a couple of bucks, cut it in half, put the tank on it's corner for about 10 minutes, and sucked the stuff out in about 6 rounds.  Of course you have to be careful not to let it get near your mouth - it'd probably put hair on your chest if you did, though.  

Was able to get 95% of the excess out this way and then rotated the tank around for the next few hours to spread the little that was left around. If you also bought a 1/4 or 3/8" tube, you could probably get the rest out.

Also, I had some vent contraption in my tank that wasn't removable - it had little flaps.  I tried to keep the sealer off but it was impossible so I used a giant swab (18" long drill bit with a paper towel wrapped around the end) dipped in acetone to clean the doors and hinges of the vent apparatus off afterwards.  Seems to have done the job.

Thanks for sharing your tips and tricks.  We appreciate you choosing KBS Coatings.