Sealing Thru-transom Screws

[JustMrWill]

I want to temporarily remove my swim platform so that I can buff and wax the transom (pain the the butt with all the hardware in place). <br /><br />What should I use on the screws/screwholes to make sure that it doesn't leak afterwards? <br /><br />-JustMrWill

 

[KaGee]

Re: Sealing Thru-transom Screws

5200 3M sealant.

 

[jtexas]

Re: Sealing Thru-transom Screws

another vote for 5200

 

[JustMrWill]

Re: Sealing Thru-transom Screws

Thanks...then that is what I will get. Just hate buying something then finding out that I got the wrong stuff.. <br /><br />-JustMrWill

 

[Moody Blue]

Re: Sealing Thru-transom Screws

Be aware that the 5200 is a permanent mounting adhesive/sealant. It is great if you never intend on removing the fastened parts again. The 4200 or 4000 will work just as well but are removeable grades. I doubted whether the 5200 was really permanent until I tried to remove the speedwheel from the transom 2 weeks ago. Removed the two screws and tried to pull off the bracket. No way. Ended up having to gently knock it off with a hammer. Took a piece of gelcoat right off the hull about 3/4" x 1 1/2" where the speedwheel was mounted. I was shocked Got it all fixed up and remounted the hardware using 4200 instead. Also, don't overtighten the screws when reinstalling. That will force out all the sealant. Just tighten snug, let the sealant fully cure then tighten up completely for a waterproof seal.

 

[Mark42]

Re: Sealing Thru-transom Screws

My local dealer said they hate 5200. People use it to seal outboard motor through bolts, get it all over, then when the dealer tries to remove the o/b it won't come off the transom.

 

[JustMrWill]

Re: Sealing Thru-transom Screws

Just bought 4200 UV (I think...or was it 4000 UV)...whatever...looks like it will do the job on both my thru transom screws as well as the removable deck over my gas tank.<br /><br />-JustMrWill

 

[flashback]

Re: Sealing Thru-transom Screws

5200 is a good sealant,, but it is a permanent sealant,, if u want to take it apart, it's tough, if it is used properly, it is the best thing going....IMHO.......

 

[ethelwright]

Re: Sealing Thru-transom Screws

I have a question . I had some screw holes under the waterline of the transom . I applied some 5200 to the holes . How long do I have to wait to put my toy in the water ?

 

[JustMrWill]

Re: Sealing Thru-transom Screws

Read the container... the 4000 UV has a 24 hour cure time..the 5200 was longer but I don't remember what it was. (48hours??)<br /><br />-JustMrWill

 

[JustMrWill]

Re: Sealing Thru-transom Screws

"3M manufactures a wide array of maintenance products specifically designed to perform in the harsh marine environment. With 3M quality in every product, you can be sure of getting the results your boat deserves. This high-performance polyurethane adhesive/sealant becomes tack free in 48 hours, completely cures in 5-7 days with no shrinkage. "<br /><br />From descipt at boaterworld.<br /><br />-JustMrWill

 

[ethelwright]

Re: Sealing Thru-transom Screws

Actually I did read the container . This is a fast curing formulation --24 hours and my boat is in the water.

 

[Boomyal]

Re: Sealing Thru-transom Screws

Does all of the above mean that I should not use 5200 to seal my Smart Tab screws??? Maybe go for something that is a little less tenacious?

 

[Nos4r2]

Re: Sealing Thru-transom Screws

Yeah-use 4200 or the stuff I'm using (it's hard to get 3m 42 or 5200 here)<br />It's called Pur-Flex Marine, says on the tube it's specially developed for the sealing requirements of the marine industry and unaffected by sea water-and remains permanently flexible.

 

[Mark42]

Re: Sealing Thru-transom Screws

There is also the Boat Life brand sealer called Life Seal. Seals well, but takes a few days to cure. Stays soft like silicone, but it is not silicone and is good for parts that you want to come apart some day.