On Jun 24, 8:31 am, "jim.isbell" wrote:
On Jun 23, 12:20 pm, "Don Dando" wrote:

Hello,

I have frequently used 5200 to seal joints when restoring and building wood
boats. Many ads for used boats state that the boat has a 5200 bottom..

I contacted 3M for information on the process and they replied that 5200 was
used in many marine applications but they knew nothing of the so called
process termed "5200 Bottom".

Can anyone enlighten me on this?

Don Dando

The 3M 5200o "bottom" is a process used to restore the bottom of
wooden boats in a semi permanent way. The bottom is still in need of
restoration, but can go many years, maybe forever with a 5200 bottom.

What is done is that the bottom of the boat is sanded to bare wood.
Then 5200 is troweled on over the wood. Then while the 5200 is still
"wet" a layer of fiberglass cloth is squeegeed into the 5200.

This is a, not uncommon, repair of a leaking wooden boat bottom. It
works well and makes a solid bottom. But the wood above the repair is
still rotted and may rot even more now that it cannot breathe on the
bottom side.

I forgot to add, that you can also then add another layer of cloth
with epoxy resin in it to really do a good job.