Epoxy//resin
 

On Tue, 14 Jun 2005 13:38:40 -0400, (DK TN) wrote:

What is the differences of these two "coatings//uses" ??? Is one better
than the other for:: IN water use---Above water-line use ?? As far as I
am "concerned"---BOTH are Petro--based--chemical= products??Thanks---

You will get a ton of different opinions, so I'll tell you upfront I
am biased toward epoxy resin for home boat building with plywood.
Others have different experiences, and I respect their views.

Here's my understanding of the three most common types of resin used
in amature boat building:

polyester resin: Has less "adhesive" properties, so some plywood boat
builders have delamination problems. It can blister if in constant
contact with water. On the positive side, you can use colored gelcoat
and not have to paint the boat. And its easily the least expensive
resin available. I find it harder to use than epoxy (but to be fair,
I have only used it once). It is used extensively in all-fiberglass
construction in production boats, but I think its the least forgiving
of amature plywood boat building.

vinylester resin: A modified form of resin that has better adhesive
qualities, and is more resistant to blistering. A very good choice,
I'm told, to use in place of polyester resin. Cost is a bit less than
epoxy.

epoxy resin: Very adhesive; epoxy is also used as a glue for gluing
wooden parts together, so many builders use it exclusively for all
gluing and coating tasks. Somewhat forgiving of fit and finish
issues, as it can fill voids and contributes great strength to the
repair. Cons are the cost, it must be protected from UV or it will
degrade, some people develop allergic reactions to it in its uncured
state, and mixing can be fussy ... there are 5:1 mixtures, 2:1 and 1:1
that I am familiar with. Get those ratios wrong and the resin will
never fully cure.

Others will chime in with differing views, and I'm sure someone will
find something in my post that they will nitpick ... so do some more
research on those three types of resins before making your final
decision.
- - -
http://www.messing-about.com
Resources for the Boat Builder, Renovator and Small Boat Skipper

I guess that about sums it up for this thread...
---Joel---

Well how about one more question:

What about the construction grade adhesives? I went to HD looking for some
epoxy, and came out with some premium stuff in a big tube that is used to
join just about anything, and very strong at that. No mixing, no fuss.



"boatbuilder.org" wrote in
message ...

I guess that about sums it up for this thread...
---Joel---


--
boatbuilder.org

Not sure how that specific product will work; I do know that builders
have reported that Liquid Nails, even though it is water resistant
for construction, tends to come apart if soaked in water in a boat.

On Wed, 15 Jun 2005 22:18:47 -0400, "Chris"
wrote:

Well how about one more question:

What about the construction grade adhesives? I went to HD looking for some
epoxy, and came out with some premium stuff in a big tube that is used to
join just about anything, and very strong at that. No mixing, no fuss.



"boatbuilder.org" wrote in
message ...

I guess that about sums it up for this thread...
---Joel---


--
boatbuilder.org


- - -
http://www.messing-about.com
Resources for the Boat Builder, Renovator and Small Boat Skipper

"Chris" wrote:

Well how about one more question:

What about the construction grade adhesives? I went to HD looking for some
epoxy, and came out with some premium stuff in a big tube that is used to
join just about anything, and very strong at that. No mixing, no fuss.

snip

By definition, a house is little more than a poorly built boat.

You are talking about adhesives used to build a house.

Nuf said.

Lew

On Wed, 15 Jun 2005 22:18:47 -0400, Chris wrote:

Well how about one more question:

What about the construction grade adhesives? I went to HD looking for some
epoxy, and came out with some premium stuff in a big tube that is used to
join just about anything, and very strong at that. No mixing, no fuss.



"boatbuilder.org" wrote in
message ...

I guess that about sums it up for this thread...
---Joel---


--
boatbuilder.org

From what I've read, a certain type of premium construction adhesive is
just about as good as 5200, which is good indeed.

But it is very different from epoxy. For bonding wood to wood, new
fiberglass to old fiberglass, I would use epoxy.

For sealing under permanent deck fixtures and so on, I would use 5200. I
might consider trying the construction adhesive for something not too
important. A penny saved is a penny earned. ;-)

--Mac