4200 vs. 5200

[Mojo^]

Would 3M 4200 be appropriate for sealing bolts that go through a transom below the water line? The previous owner of my boat used 3M 5200 and to say that it was difficult to remove would be a vast understatement. I had a very difficult time removing it all when I replaced the transom core. Will 3M 4200 remain flexible yet provide an adequate seal? If there are more suitable products, I'd like to hear about them.

 

[ajgraz]

Re: 4200 vs. 5200

3M 4000 is rated for below waterline. I am using it to seal transom motor bolts, transducer screws, etc. with no problems so far. It is clearly less hard/"permanent" than 5200.

That said, if it's not a trailer boat (that is, stays at a slip) I'd stick with the more proven 5200.

 

[Mojo^]

Re: 4200 vs. 5200

It will definitely be a trailer boat and unfortunately will see much more of my back yard than it ever will water, provided that I ever get it reassembled.

 

[Woodonglass]

Re: 4200 vs. 5200

3M-4200 is the recommended product for semi permanent installations. It is 100% waterproof. You are good to go!!!

3M? Marine Fast Cure 4200 Adhesive Sealant

One part general purpose polyurethane reacts chemically with moisture for flexible bonds to wood, fiberglass, gelcoat, plastic and metals. Forms a watertight seal on joints and boat hardware above and below the waterline. Formulated to allow for disassembly of parts.

 

[oops!]

Re: 4200 vs. 5200

5200 is permanant. 4200 is not

 

[BWT]

Re: 4200 vs. 5200

Stick with 4200; waterproofing properties are comparable; however dis-assembly is not@!