Marine glue

[onetriphudson]

This last week I installed a FF using 3M 5200 and was really surprised that it has taken 5 full days to set. The 5200 was still tacky as of yesterday afternoon and I put it on last Thursday. I'm hoping that it will be completely cured by this evening so that I can put the kayak in it's rack. The label says it should cure in 24 hours but it was still just goo. This is after I dragged the kayak into the yard Saturday so it would get air, and then when I moved it (delicately) back into the garage that evening I put a fan blowing air through it (just in case this was an issue with circulation). This was a sponge mount cut-away method for the transducer thru-hull.

I used 5200 on a Prowler 13 FF install a few years back and don't remember it taking this long.

[tunaseeker]

West Marine carries an epoxy that is made for polyethylene repairs but it does require that you heat treat the surface. I just used this to put in an automati bilge pump made by Whale. Cost 20$ but get about a large syringe full (2 parts). Yellow and white package. Just my2cents

[wiredantz]

Have OEX do it, or else you will sink your new boat.

[Jimmyz123]

Originally Posted by wiredantz

Have OEX do it, or else you will sink your new boat.

Not a bad recommendation. Anything major I would let them do it also. Little things like rod holders and that kind of thing I can manage.

[Fiskadoro]

Originally Posted by onetriphudson

This last week I installed a FF using 3M 5200 and was really surprised that it has taken 5 full days to set.

5200 is the standard 4200 is the faster drying version but they both dry slow. Longer it takes to dry the stronger it bonds.

Jim

[onetriphudson]

Originally Posted by Jim Day

5200 is the standard 4200 is the faster drying version but they both dry slow. Longer it takes to dry the stronger it bonds.

Jim

That's what I was hoping / assuming... as of last night (5th full day) it seemed pretty cured and quite solid.

[steveooo]

Originally Posted by onetriphudson

This last week I installed a FF using 3M 5200 and was really surprised that it has taken 5 full days to set. The 5200 was still tacky as of yesterday afternoon and I put it on last Thursday. I'm hoping that it will be completely cured by this evening so that I can put the kayak in it's rack. The label says it should cure in 24 hours but it was still just goo. This is after I dragged the kayak into the yard Saturday so it would get air, and then when I moved it (delicately) back into the garage that evening I put a fan blowing air through it (just in case this was an issue with circulation). This was a sponge mount cut-away method for the transducer thru-hull.

I used 5200 on a Prowler 13 FF install a few years back and don't remember it taking this long.

It may be possible that you have the slow cure version, or you allowed alcohol/acetone or another solvent to come in contact with the 5200, which will inhibit curing. Did you clean the area you were using it on with any solvents? If not, check the color of your 5200 label. Red = Fast, Blue = Slow.



3M™ Marine Adhesive/Sealant 5200
This high-performance polyurethane adhesive/sealant becomes tack free in 48 hours, completely cures in 5-7 days with no shrinkage.



3M™ Marine Adhesive/Sealant Fast Cure 5200
This high-performance polyurethane becomes tack free in one hour and fully cures in approximately 24 hours.



Slower cure has higher bonding strength, but not by a huge amount. Both versions aren't really recommended for plastics, and have relatively poor bonding strength to most plastics. But, in most yak applications the 5200 is being used as a sealant, and not a true adhesive, so its not that big a deal in the grand scheme of things. Especially since the areas we seal below the waterline on kayaks are only a few inches deep, so the water pressure isn't that great to begin with.

Potato, Potahtoe.

[Fiskadoro]

Originally Posted by steveooo

Red = Fast, Blue = Slow.






Potato, Potahtoe.

That's interesting it used to be that the faster cure was considered a different product.





I wonder if there is any difference between 4200 fast and 5200 fast?

Personally I've only used the original 5200 and the faster 4200, but I have used a lot of it in marine applications like thru-hulls for large boats.

4200 hundred dries is faster, and is sticky stuff, we used it mainly for caulking above water seams, windows, trim, etc... but the original 5200 definitely sticks better once it completely cures, and we used that mostly for below the water line applications like through hulls. Keep in mind that when you use it on big boats the boat is often only out of the water (hauled out) for a few days so even if it's not fully cured on jobs like tru-hulls it does seal in a relatively short period of time, and continues to cure even if in the water.

As to adhesion. I've ripped sections of fiberglass right off a hull trying to get things stuck with 5200 off fiberglass. Once it sticks it sticks good.

Jim

[onetriphudson]

I scrubbed the area with light grit sandpaper and then wiped it with a small amount of acetone and paper towel. The acetone was long gone before I applied a sponge with cutaway shape for transX. When I filled the cavity with the 5200 it was easy to set in the puck and push it down firm.

I'm pretty sure this is the slow cure but the back of the label says that it sets in 24 hours? It's the marine stuff for sure. The lack of airflow, colder temps and sponge border could all be factors. The weird part was that even the goo on the top edges where it squeezed up was tacky as of Sunday (4 days). Seems to me that would be the first part to harden.

I'd just advise guys to plan on leaving 5200 adhesive items alone for 4 or 5 days at least. No point in risking your hard work!

[steveooo]

Originally Posted by Jim Day

I wonder if there is any difference between 4200 fast and 5200 fast.

Jim

Tensile strength for the 3M 4200 is 300 PSI, the 5200 fast cure is 600 PSI, the 5200 slow cure is 700 PSI.

All those numbers are for adhesion under ideal conditions. On gelcoat the 5200 tensile strength is 519 PSI, and for adhesion to polyethylene that number drops down to 48 PSI.


The Marine Goop tensile strength starts around 3800 PSI under ideal conditions, and is at about 1700 PSI on some plastics. Much stronger that the 5200, but all of this is still ridiculous overkill for the sealant properties that we actualy use them for.

[bubblehide]

Originally Posted by steveooo

Tensile strength for the 3M 4200 is 300 PSI, the 5200 fast cure is 600 PSI, the 5200 slow cure is 700 PSI.

All those numbers are for adhesion under ideal conditions. On gelcoat the 5200 tensile strength is 519 PSI, and for adhesion to polyethylene that number drops down to 48 PSI.


The Marine Goop tensile strength starts around 3800 PSI under ideal conditions, and is at about 1700 PSI on some plastics. Much stronger that the 5200, but all of this is still ridiculous overkill for the sealant properties that we actualy use them for.

Steve, where are you getting those specifications from?