what would be the preferred material for the gas tank cover? The gap all around is about a light 1/8" and it was smutched neatly in there 3/4" deep. It was still white and soft and came out pretty easy.[I thought it was going to be a horror.] How about the 4200 uv?, or anything uv?

I use the 4000 everywhere topside with good luck

Id use 5200 on it...Ive never used the 4000 as spare says, but Im sure its good stuff if he is using it.


Also on the 5200 (or any caulk for hatches) run you a piece of heavy mono like 100-130# all the way around under the caulk and in one corner out of the way leave a small tag sticking out. This way you can pull it and cut the caulk if you have to.

The 4000 would be better for a hatch cover for the fact it will seal it, but not permanently. 5200 can be some tough stuff to get off later. 4000 is meant to seal, whereas 5200 is meant to seal and be an adhesive.

:you:I just thought about re-sealing some inspection plates and got it on my hands.

I used 4200 on mine I hope I don't ever have o take i up!

yeah, I don't think there is a need for the 5200, my concern is uv tolerant.....would hate to see a few weeks down the road all that chaulk getting yellow/brown discolor from the sun. My floor looks factory new now. Now that I think about it, doesn't the 4000 say UV right on the label?? BTW, thanks for the input fellas.

4000 is more UV resistant than 5200 the last I checked. 5200 is really meant for bonding and sealing below the waterline, 4000 is meant for hatches and portholes.

Yes, there is 4200, 5200, and 4000UV