Replacing Transom Scuppers - which 3M sealant 4200 or 5200?

S

sal

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May 15, 2004
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13641
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I'm replacing the old plastic scuppers and the floor drains on the port and starboard sides of my boat with new stainless types.
I'm deciding which sealant to use, 3M 4200 or 5200.
From what I am reading the 4200 isn't permanent while the 5200 is.
Of the two, only the 5200 is claimed to be good above and below the waterline.
While I wouldn't expect to have to replace this hardware again, I like the flexibility if I ever had to for some reason.
The floor drains will get wet when it is raining or during wash downs but shouldn't be submerged in water often but if leaves clog the drain, they could be.
The transom scuppers are at the waterline, so they could get submerged when the boat is in the water (I trailer the boat).
Therefore, the 4200 might be good enough and if I ever had to remove the drain or scuppers, it will easier to deal with if I use 4200.
So is 4200 good enough, or should I stick with the 5200 which is the one that is good above or below the waterline?
(I am also replacing the both of the old 1- 1/2" inside diameter hose and using all new SS clamps.)

Thanks!
 
I've used 4200 below the waterline for mounting transducers, when I've replaced scuppers, and other small screw holes. Honestly, never heard it was not for below waterline before. FWIW, never had a problem.

update: just went to the 3M site, here's what it said in short, "
Excellent for Applications Above and Below the Water Line
3M™ Marine Adhesive Sealant Fast Cure 4200FC chemically reacts with moisture, delivering flexible bonds with good adhesion to wood, fiberglass, gelcoat, plastics and metals. This multi-purpose adhesive bonds dissimilar materials, forming a watertight, weather-resistant seal on joints and boat hardware above and below the waterline. The flexibility of 3M™ Marine Adhesive Sealant Fast Cure 4200FC (PDF, 443.47 Kb) allows for joint movement and stress caused by shock, vibration, swelling or shrinking. Permanently elastic, this medium strength sealant adheres to a wide variety of substrates and allows for disassembly of parts after prolonged use. Available in cartridge and sausage packs to meet your application needs. "

 
L. Keith said:
5200 should only be used to glue the soles of your Topsiders back on after a blow out.
Click to expand...
Agreed. It’s used way too frequently as a sealant on things that might someday need to come off. Really good adhesive, but the drastic overkill for sealing fittings comes back to bite later.
 
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