I did it myself 2 yrs ago -not too bad
first I had the bottom sandblasted
then fill in all the blisters with a west system mixture that is thick enough so it doesn't sag. -you'll do this about 3-4 times sanding between coats. (I used a window squeegy to put on the west sysytem)
the bottom came out great and i put a few coats of the interlux 2001 barrier coat on
give it a try
