Help with transom adhesive

[JGeiman2]

I'm currently in the process of adding an additional 5 inches to the transom of my old smokercraft. I'm wondering what sealant/adhesive you recommend to block out the water? The 5200 doesn't say its recommended for metal. Would silicone be fine or is there some sort of marine grade sealant that I could use.

The boat is aluminum and I'm usuing steel for the additional 5 inches of height.

Thank you!

 

[carverdan]

Re: Help with transom adhesive

you really should not use steel with aluminum, but if you must, use a butyl caulk like life caulk, or you can use a polyurethane caulk which will also bond well. watch for corrosion at the steel aluminum seam.

 

[JGeiman2]

Re: Help with transom adhesive

Even with the caulk between the two, you think there will still be some corrosion?

I have a 10 in. plate going the width of the transom, 5 inches will be in contact with the aluminum. All I'm looking to do is apply caulk, place the steel in, then wood, then another steel plate.

 

[carverdan]

Re: Help with transom adhesive

You will probably be allright just keep an eye on it and of course paint the steel with a good epoxy primer and polyurethane paint. must be your engine is to long? hence the extension?

 

[Sixmark]

Re: Help with transom adhesive

There is most definately going to be a corrosion issue, you could probably go to any recycling or salvage yard and get a section of aluminum that size for a relatively good deal.

 

[ezmobee]

Re: Help with transom adhesive

Street sign

 

[JGeiman2]

Re: Help with transom adhesive

I coated the steel with alkyd paint and there will be 5200 between the two. I have two coats of paint on the steel.
I guess ill try it and if i have to ill do it over...

 

[Sixmark]

Re: Help with transom adhesive

Street sign

Of course he means a street sign aquired by completely legal methods