Before I install the rub rail I have a question

[dshaff24]

Okay Im going to mount my rubrail and Been thinking, Should I put the 4200 silicon around where the hulls meet Then put the rubrail on? OR do I mount the rub rail and then put the 4200 silicon?

[mapleleaf]

Thats a good question...I don't see how it would hurt to, except for maybe the next person that tries to take it apart. That and you'll use another couple tubes.....

[wotan2525]

Probably wouldn't hurt but might be messier to clean up. I put regular 100% silicone (per Jim @ Viper) on every screw and then along the bottom edge.

[Okie Boarder]

I'd say to put the silicone along the bottom edge and any other leak points then put the rub rail on. Then do another bead on the bottom of the rub rail.

[csuggs]

What Okie said. And I would use 100% silicone (clear) - there's no need for 4200 unless you are below the water line.

[dshaff24]

What Okie said. And I would use 100% silicone (clear) - there's no need for 4200 unless you are below the water line.

4200 is for above water and 5200 is below!

[csuggs]

OK - I was pretty sure that both were used underwater, but that 5200 was more permanent than 4200. Guess I was wrong. Either way, I think most use 100% silicone to fill and seal around the rub rail.

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.


3M™ Marine Fast Cure 5200 Adhesive Sealant
A faster curing version of 3M™ Marine 4200 Adhesive Sealant. The high performance polyurethane becomes tack free in one hour and fully cures in approximately 24 hours. The seal is extremely strong, retains its strength above or below the water line. Stays flexible and allows for structural movement. Has excellent resistance to weathering and salt water. Easy to apply with manual caulking gun.

[OUI]

Don't use either one -- 5200 and 4200 are way to strong a bond. Use standard silicone, it will seal the area from moisture, but it won't adhere to the boat or the rubrail.

[dshaff24]

OK - I was pretty sure that both were used underwater, but that 5200 was more permanent than 4200. Guess I was wrong. Either way, I think most use 100% silicone to fill and seal around the rub rail.

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.


3M™ Marine Fast Cure 5200 Adhesive Sealant
A faster curing version of 3M™ Marine 4200 Adhesive Sealant. The high performance polyurethane becomes tack free in one hour and fully cures in approximately 24 hours. The seal is extremely strong, retains its strength above or below the water line. Stays flexible and allows for structural movement. Has excellent resistance to weathering and salt water. Easy to apply with manual caulking gun.

Yeah I do Believe Now that that 4200 would HOLD my boat together with out the rivets or screws! That is some tough stuff! I don't know who but I asked on here and everyone told me to go 4200 so I did! Oh well this boat Will not becoming back apart