Ummm, none is probably preferable.

Water always gets past sealant and gets trapped and rots it out.

Something like POR 15 is good if you already are covering up rust,
otherwise a clear drainage path over paint is the best in my mind.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

KEN wrote:
>
> What kind of sealant should I use when installing diamond plate?

 

I used to build trailers for Budd in the 70's. We used plastic tape between
the aluminum sides and the steel crossmembers. I wouldn't necessarily use
plastic tape, but you really need to have some barrier between the two
dissimilar metals. Galvanic action will start and in a few years your
aluminum will start falling off where it is corroding. My 2centavos FWIW.
Personally, I'd recommend against aluminum and just fix the corners
instead....
Rich
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3F3E9995.1B86B0C3@sympatico.ca...
> Ummm, none is probably preferable.
>
> Water always gets past sealant and gets trapped and rots it out.
>
> Something like POR 15 is good if you already are covering up rust,
> otherwise a clear drainage path over paint is the best in my mind.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> KEN wrote:
> >
> > What kind of sealant should I use when installing diamond plate?

 

i was being a little sarcastic before, but if i were putting on corner
panels i probably would indeed tig them to the body. of course, this isnt
an option if youre using aluminum or stainless plate.

--
Nathan W. Collier
http://7SlotGrille.com

 

3m makes a sealant called 5200 it is a permanent attachment fer sure so if u
use it will be there for a while--most any marine shop should have.