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This last week I installed a FF using 3M 5200 and was really surprised that it has taken 5 full days to set. The 5200 was still tacky as of yesterday afternoon and I put it on last Thursday. I'm hoping that it will be completely cured by this evening so that I can put the kayak in it's rack. The label says it should cure in 24 hours but it was still just goo. This is after I dragged the kayak into the yard Saturday so it would get air, and then when I moved it (delicately) back into the garage that evening I put a fan blowing air through it (just in case this was an issue with circulation). This was a sponge mount cut-away method for the transducer thru-hull.
I used 5200 on a Prowler 13 FF install a few years back and don't remember it taking this long.
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