Thinning epoxy barrier coat
 

Can I successfully use acetone to thin epoxy barrier coats? I am thinking of
Interlux 404/414 in particular, but the question is also a general one.

I am aware that there are proprietary products for this application, but I
need to paint tomorrow morning, and the nearest dealer is about 60 miles
away.

Bob Swarts

Robert or Karen Swarts wrote:
Can I successfully use acetone to thin epoxy barrier coats? I am thinking of
Interlux 404/414 in particular, but the question is also a general one.


Denatured alcohol (stove fuel) is the standard epoxy thinner.

About 5% max works for me.

Lew

On Fri, 19 Aug 2005 19:32:13 -0700, "Robert or Karen Swarts"
wrote:

Can I successfully use acetone to thin epoxy barrier coats? I am thinking of
Interlux 404/414 in particular, but the question is also a general one.

I am aware that there are proprietary products for this application, but I
need to paint tomorrow morning, and the nearest dealer is about 60 miles
away.

The question is debatable. Some say you should not thin epoxy. I don't
know what you are doing. Can't say.

Interlux 404/414 is not a barrier coat. It's a sandable primer whose
function is to provide a tie coat between sime substrate and an impervious
finish coat such as an LPU paint. If applied as directed, it's just loaded
with expensive solvents and is consequently pretty porous. Useless under
bottom paint. If you are using it as a primer under finish paint and not
under bottom paint, go for it. I'd try acetone. Let us know your result.

"Robert or Karen Swarts" wrote in message
...
Can I successfully use acetone to thin epoxy barrier coats? I am thinking
of
Interlux 404/414 in particular, but the question is also a general one.

I am aware that there are proprietary products for this application, but I
need to paint tomorrow morning, and the nearest dealer is about 60 miles
away.

Bob Swarts

Just for the record, Jim, the can is labeled Epoxy Barrier-Kote. And the
catalog describes is as suitable for above or below water applications. The
directions also state that it must be thinned.

Thanks for your thoughts.

BS

"Jim Conlin" wrote in message
...
Interlux 404/414 is not a barrier coat. It's a sandable primer whose
function is to provide a tie coat between sime substrate and an impervious
finish coat such as an LPU paint. If applied as directed, it's just
loaded
with expensive solvents and is consequently pretty porous. Useless under
bottom paint. If you are using it as a primer under finish paint and not
under bottom paint, go for it. I'd try acetone. Let us know your result.

"Robert or Karen Swarts" wrote in message
...
Can I successfully use acetone to thin epoxy barrier coats? I am thinking
of
Interlux 404/414 in particular, but the question is also a general one.

I am aware that there are proprietary products for this application, but
I
need to paint tomorrow morning, and the nearest dealer is about 60 miles
away.

Bob Swarts

Hi

Before using that please note that a lot of Denatured alcohol , acturly
contain up to 8 pct. water.
Now there are many way's to take out the water, carbide the stuff that
was used in old acetylen lamps are one of the most eficient , but there
proberly are other chemicals that will react with the water and leave
the alcohol , ---- it is the same problem with frensh polishing , that
you must find Denatured alcohol 99.9 pct alcohol to get the best
results normal Denatured alcohol acturly contain water.

I'm jumping in on this late, so forgive me if I'm off track ..I just saw the
reference to 404/414 Barrier Kote from Interlux, my favorite primer, and it
looks like there's some controversy on what it is. The reason that it's
called Epoxy Barrier Kote is because some coatings, paint that is, get
unhappy with leftover amines and what not on cured epoxy. To paint the
epoxy with such a paint, alkyd enamels for example, you need to sand, wash,
and prime the epoxy with an appropriate barrier coat that sticks well to
epoxy and provides a good substrate that he paint also sticks well to. The
Interlux 404/414 Barrier Kote (stinky but good) makes a very good primer for
protecting paints from epoxy chemistry that might still be on the boat, and
it's very high body (hides defects) and sands well too. Like I said, stinky
but good. Keep the doors open.

Brian D



"Robert or Karen Swarts" wrote in message
...
Just for the record, Jim, the can is labeled Epoxy Barrier-Kote. And the
catalog describes is as suitable for above or below water applications.
The directions also state that it must be thinned.

Thanks for your thoughts.

BS

"Jim Conlin" wrote in message
...
Interlux 404/414 is not a barrier coat. It's a sandable primer whose
function is to provide a tie coat between sime substrate and an
impervious
finish coat such as an LPU paint. If applied as directed, it's just
loaded
with expensive solvents and is consequently pretty porous. Useless under
bottom paint. If you are using it as a primer under finish paint and
not
under bottom paint, go for it. I'd try acetone. Let us know your
result.

"Robert or Karen Swarts" wrote in message
...
Can I successfully use acetone to thin epoxy barrier coats? I am
thinking
of
Interlux 404/414 in particular, but the question is also a general one.

I am aware that there are proprietary products for this application, but
I
need to paint tomorrow morning, and the nearest dealer is about 60 miles
away.

Bob Swarts

When thinned as directed, 404/414 is very porous and only prevents the
passage of bacteria and up. 404/414 is not a barrier coating in the sense
that it prevents osmotic blistering ('pox'). Not the usual meaning of
'barrier coat', in spite of interlux's labelling. The Interlux product for
that is Interprotect 2000. . Being epoxy-based, it provides good
mechanical bond for oher finishes.
"Robert or Karen Swarts" wrote in message
...
Just for the record, Jim, the can is labeled Epoxy Barrier-Kote. And the
catalog describes is as suitable for above or below water applications.
The
directions also state that it must be thinned.

Thanks for your thoughts.

BS

"Jim Conlin" wrote in message
...
Interlux 404/414 is not a barrier coat. It's a sandable primer whose
function is to provide a tie coat between sime substrate and an
impervious
finish coat such as an LPU paint. If applied as directed, it's just
loaded
with expensive solvents and is consequently pretty porous. Useless
under
bottom paint. If you are using it as a primer under finish paint and
not
under bottom paint, go for it. I'd try acetone. Let us know your
result.

"Robert or Karen Swarts" wrote in message
...
Can I successfully use acetone to thin epoxy barrier coats? I am
thinking
of
Interlux 404/414 in particular, but the question is also a general one.

I am aware that there are proprietary products for this application,
but
I
need to paint tomorrow morning, and the nearest dealer is about 60
miles
away.

Bob Swarts

Thank you all for your comments.

For the record, I ended up thinning it about 20% with alcohol. This worked
well as far as thinning is concerned, but the alcohol apparently evaporates
too fast. It is impossible for the brush strokes to flow out well. So --
more sanding. The good news is that it finds, and with persistence, fills --
or at least coats -- about every pin hole in the resin base. It dries
quickly and appears to sand well. I am actually using it as a primer under
Interprotect 2000 BTW.

This is the second time I have purchased Interlux products which have been
described as applicable to things I later found out they were not truly
suitable for.

BS

"Robert or Karen Swarts" wrote in message
...
Just for the record, Jim, the can is labeled Epoxy Barrier-Kote. And the
catalog describes is as suitable for above or below water applications.
The directions also state that it must be thinned.

Thanks for your thoughts.

BS

"Jim Conlin" wrote in message
...
Interlux 404/414 is not a barrier coat. It's a sandable primer whose
function is to provide a tie coat between sime substrate and an
impervious
finish coat such as an LPU paint. If applied as directed, it's just
loaded
with expensive solvents and is consequently pretty porous. Useless under
bottom paint. If you are using it as a primer under finish paint and
not
under bottom paint, go for it. I'd try acetone. Let us know your
result.

"Robert or Karen Swarts" wrote in message
...
Can I successfully use acetone to thin epoxy barrier coats? I am
thinking
of
Interlux 404/414 in particular, but the question is also a general one.

I am aware that there are proprietary products for this application, but
I
need to paint tomorrow morning, and the nearest dealer is about 60 miles
away.

Bob Swarts

Unfortunate terms ...what would you call a primer that's designed to act as
a chemical barrier between alkyd enamel and amines on epoxy?

As a point of information, I spent quite a bit of time on the phone with a
paint expert (working for Ameron) once and he explained that topsides paints
work by blocking moisture in the short term but were unable to block it in
the long term. If kept in the water, moisture could get underneath it
eventually, but then not be able to get back out quickly enough to prevent
blistering when heated by the sun. Below the waterline paints he explained,
were designed to allow moisture to flow in and out more easily and this
prevented blistering ...but required a waterproof substrate instead. I'm
confused because I would guess that waterproofness was what determined if a
paint was for below the waterline or not. Or maybe he was implying that
there was no truly waterproof paints? Maybe Awlgrip or Sterling? Anyone??

Brian


"Jim Conlin" wrote in message
...
When thinned as directed, 404/414 is very porous and only prevents the
passage of bacteria and up. 404/414 is not a barrier coating in the sense
that it prevents osmotic blistering ('pox'). Not the usual meaning of
'barrier coat', in spite of interlux's labelling. The Interlux product
for
that is Interprotect 2000. . Being epoxy-based, it provides good
mechanical bond for oher finishes.
"Robert or Karen Swarts" wrote in message
...
Just for the record, Jim, the can is labeled Epoxy Barrier-Kote. And the
catalog describes is as suitable for above or below water applications.
The
directions also state that it must be thinned.

Thanks for your thoughts.

BS

"Jim Conlin" wrote in message
...
Interlux 404/414 is not a barrier coat. It's a sandable primer whose
function is to provide a tie coat between sime substrate and an
impervious
finish coat such as an LPU paint. If applied as directed, it's just
loaded
with expensive solvents and is consequently pretty porous. Useless
under
bottom paint. If you are using it as a primer under finish paint and
not
under bottom paint, go for it. I'd try acetone. Let us know your
result.

"Robert or Karen Swarts" wrote in message
...
Can I successfully use acetone to thin epoxy barrier coats? I am
thinking
of
Interlux 404/414 in particular, but the question is also a general
one.

I am aware that there are proprietary products for this application,
but
I
need to paint tomorrow morning, and the nearest dealer is about 60
miles
away.

Bob Swarts