posted June 24, 2002 01:36 PM            

3M 5200
"Tack free in 48 hours, completely cures in 5 to 7 days. The bond is extremely strong, retains its strength above or below the waterline. Use on fiberglass deck to fiberglass hull, wood to fiberglass, portholes and deck fittings, motors on fiberglass transoms, under mouldings, hull seams above and below the water line. For permanent bonds."
The operative word here is PERMANENT!
It was used for the depth sounder transducer below the waterline.

However we have been using 3M 4200 for bedding fittings above the waterline. 4200 will allow for the possible removal or rebedding of stanchion bases and cleats etc.

3M 4200
"A one-part general all-purpose polyurethane that chemically reacts with moisture to deliver flexible bonds with good adhesion to wood, fiberglass, gelcoat, plastics and metals. Paintable and sandable. Forms watertight weather-resistant seals on joints and boat hardware above or below the waterline. On plastics test to determine suitability. For non-permanent applications."

We have not tried 3M 101 sealant which is a polysulphide compound.

BTW this stuff wrecks your clothing before it's fully cured......stains hands too.