The only problem is that the best marine polysulfide, 3M 101, was taken off the market. All we are left with is Boat Life Life Calk... I never liked it as much as 3M 101.I prefer polysulfide. More permanent than butyl tape but stays flexible so it can be removed easier than 5200. Also better adherence than butyl or silicone. BTW, everyone it seems has their own opinion on this and there does not seem to be a universal answer. You will get arguments for and against everything! Just rebedded mine with polysulfide.