uv blocker for epoxy
 

I remember reading about uv blockers that could be added to epoxy - any
experience?

--
Robert Haston
Satellite Beach, FL

On Mon, 10 Jan 2005 02:05:36 +0000, Robert Haston wrote:

I remember reading about uv blockers that could be added to epoxy - any
experience?

I added graphite powder to an epoxy casting once. Because it is totally
opaque, it is a good UV blocker. This is probably not what you are
looking for, though. You probably want a UV blocker for a clear epoxy
coating.

--Mac

Mac wrote:

On Mon, 10 Jan 2005 02:05:36 +0000, Robert Haston wrote:

I remember reading about uv blockers that could be added to epoxy - any
experience?

I added graphite powder to an epoxy casting once. Because it is totally
opaque, it is a good UV blocker. This is probably not what you are
looking for, though. You probably want a UV blocker for a clear epoxy
coating.

--Mac

adding chemicals to the epoxies messes them all up - so no in epoxy UV
blocker except pigments are available.

Note that most clear coat products have almost no uv blockers. Exceptions are
auto clear coat and a similar product offered by one of the epoxy vendors.
Also know of a 1 part waterbased acrylic clear with UV blockers but would
only use it on interior applications.

note that varnish makes a good epoxy UV blocking topcoat too.

paul oman
progressive epoxy polymers
www.epoxyproducts.com/marine.html



--


"Living on Earth is expensive, but it does include
a free trip around the Sun every year."


============================================
PAUL OMAN Progressive Epoxy Polymers, Inc.
Frog Pond Hollow - 48 Wildwood Dr
Pittsfield NH 03263
10-4 Monday-Thur EST 603-435-7199
VISA/MC/Discover/Paypal

http://www.epoxyproducts.com
sign-up for free email newsletter!
============================================

The other answers are not quite correct ...they are true but are also
missing some info. Look at the bottom of my boat at
http://www.reelboats.com (page through the construction notes and photos)
and look at the graphite bottom. I put about a teaspoon of graphite into
each 2 ounces of epoxy AND I used System III SB-112 epoxy. The SB-112 epoxy
was developed for surfboards, no top coat required. It already has UV
inhibitors built in. It's also safe to use on polystyrene and similar
materials without them dissolving before your eyes when you apply the epoxy.
The only thing that I have to say is that you get best results if you sand
before putting it on, and don't write on the boat with a permanent pen
before coating with it (it is permanent-pen-phobic as far as I can tell,
grinz.) I won't tell you about how I found out these two things ...just put
it on clean sanded epoxy or wood and you'll be happy. Works great.

If you don't want to use the SB-112, then you are pretty much limited to a
topcoat such as paint or a good marine varnish with UV inhibitors in it. I
don't know of any other UV inhibited epoxy out there. The graphite alone is
used by a great many people and I've done it with regular epoxy too, and
never had it chalk up or get cloudy or otherwise indicate that UV
degradation was occurring. Of course that was only on boat bottoms here in
the Pacific Northwest (US) where it never really gets hot anyway. Your
mileage may vary. On the big boat referenced above, I found out about the
SB-112 in time and just said to heck with it ...paid the price for the stuff
AND added graphite. I'm happy. The smallest kit put 2 coats on the boat.
Cheap enough for me.

Brian D



"Robert Haston" wrote in message
ink.net...
I remember reading about uv blockers that could be added to epoxy - any
experience?

--
Robert Haston
Satellite Beach, FL

A two part urethane (LPU) with uv blocker is tougher more gloss resistant etc.
than any epoxy it would be covering

paul oman
progressive epoxy polymers


Brian D wrote:

The other answers are not quite correct ...they are true but are also
missing some info. Look at the bottom of my boat at
http://www.reelboats.com (page through the construction notes and photos)
and look at the graphite bottom. I put about a teaspoon of graphite into
each 2 ounces of epoxy AND I used System III SB-112 epoxy. The SB-112 epoxy
was developed for surfboards, no top coat required. It already has UV
inhibitors built in. It's also safe to use on polystyrene and similar
materials without them dissolving before your eyes when you apply the epoxy.
The only thing that I have to say is that you get best results if you sand
before putting it on, and don't write on the boat with a permanent pen
before coating with it (it is permanent-pen-phobic as far as I can tell,
grinz.) I won't tell you about how I found out these two things ...just put
it on clean sanded epoxy or wood and you'll be happy. Works great.

If you don't want to use the SB-112, then you are pretty much limited to a
topcoat such as paint or a good marine varnish with UV inhibitors in it. I
don't know of any other UV inhibited epoxy out there. The graphite alone is
used by a great many people and I've done it with regular epoxy too, and
never had it chalk up or get cloudy or otherwise indicate that UV
degradation was occurring. Of course that was only on boat bottoms here in
the Pacific Northwest (US) where it never really gets hot anyway. Your
mileage may vary. On the big boat referenced above, I found out about the
SB-112 in time and just said to heck with it ...paid the price for the stuff
AND added graphite. I'm happy. The smallest kit put 2 coats on the boat.
Cheap enough for me.

Brian D

"Robert Haston" wrote in message
ink.net...
I remember reading about uv blockers that could be added to epoxy - any
experience?

--
Robert Haston
Satellite Beach, FL





--


"Living on Earth is expensive, but it does include
a free trip around the Sun every year."


============================================
PAUL OMAN Progressive Epoxy Polymers, Inc.
Frog Pond Hollow - 48 Wildwood Dr
Pittsfield NH 03263
10-4 Monday-Thur EST 603-435-7199
VISA/MC/Discover/Paypal

http://www.epoxyproducts.com
sign-up for free email newsletter!
============================================

Good point. Can you repair gouges through LPU on top of epoxy by just
applying more epoxy? I mean, will epoxy stick to LPU very well?

Thx,
Brian D



"Paul Oman" wrote in message
...

A two part urethane (LPU) with uv blocker is tougher more gloss resistant
etc.
than any epoxy it would be covering

paul oman
progressive epoxy polymers


Brian D wrote:

The other answers are not quite correct ...they are true but are also
missing some info. Look at the bottom of my boat at
http://www.reelboats.com (page through the construction notes and photos)
and look at the graphite bottom. I put about a teaspoon of graphite into
each 2 ounces of epoxy AND I used System III SB-112 epoxy. The SB-112
epoxy
was developed for surfboards, no top coat required. It already has UV
inhibitors built in. It's also safe to use on polystyrene and similar
materials without them dissolving before your eyes when you apply the
epoxy.
The only thing that I have to say is that you get best results if you
sand
before putting it on, and don't write on the boat with a permanent pen
before coating with it (it is permanent-pen-phobic as far as I can tell,
grinz.) I won't tell you about how I found out these two things ...just
put
it on clean sanded epoxy or wood and you'll be happy. Works great.

If you don't want to use the SB-112, then you are pretty much limited to
a
topcoat such as paint or a good marine varnish with UV inhibitors in it.
I
don't know of any other UV inhibited epoxy out there. The graphite alone
is
used by a great many people and I've done it with regular epoxy too, and
never had it chalk up or get cloudy or otherwise indicate that UV
degradation was occurring. Of course that was only on boat bottoms here
in
the Pacific Northwest (US) where it never really gets hot anyway. Your
mileage may vary. On the big boat referenced above, I found out about
the
SB-112 in time and just said to heck with it ...paid the price for the
stuff
AND added graphite. I'm happy. The smallest kit put 2 coats on the
boat.
Cheap enough for me.

Brian D

"Robert Haston" wrote in message
ink.net...
I remember reading about uv blockers that could be added to epoxy - any
experience?

--
Robert Haston
Satellite Beach, FL





--


"Living on Earth is expensive, but it does include
a free trip around the Sun every year."


============================================
PAUL OMAN Progressive Epoxy Polymers, Inc.
Frog Pond Hollow - 48 Wildwood Dr
Pittsfield NH 03263
10-4 Monday-Thur EST 603-435-7199
VISA/MC/Discover/Paypal

http://www.epoxyproducts.com
sign-up for free email newsletter!
============================================

Brian D wrote:

Good point. Can you repair gouges through LPU on top of epoxy by just
applying more epoxy? I mean, will epoxy stick to LPU very well?

Thx,
Brian D


---- Yes LPU coatings are urethane paints after everything is said and done and
epoxies regularly go over and bond to well adhered paint..

paul




"Paul Oman" wrote in message
...

A two part urethane (LPU) with uv blocker is tougher more gloss resistant
etc.
than any epoxy it would be covering

paul oman
progressive epoxy polymers


Brian D wrote:

The other answers are not quite correct ...they are true but are also
missing some info. Look at the bottom of my boat at
http://www.reelboats.com (page through the construction notes and photos)
and look at the graphite bottom. I put about a teaspoon of graphite into
each 2 ounces of epoxy AND I used System III SB-112 epoxy. The SB-112
epoxy
was developed for surfboards, no top coat required. It already has UV
inhibitors built in. It's also safe to use on polystyrene and similar
materials without them dissolving before your eyes when you apply the
epoxy.
The only thing that I have to say is that you get best results if you
sand
before putting it on, and don't write on the boat with a permanent pen
before coating with it (it is permanent-pen-phobic as far as I can tell,
grinz.) I won't tell you about how I found out these two things ...just
put
it on clean sanded epoxy or wood and you'll be happy. Works great.

If you don't want to use the SB-112, then you are pretty much limited to
a
topcoat such as paint or a good marine varnish with UV inhibitors in it.
I
don't know of any other UV inhibited epoxy out there. The graphite alone
is
used by a great many people and I've done it with regular epoxy too, and
never had it chalk up or get cloudy or otherwise indicate that UV
degradation was occurring. Of course that was only on boat bottoms here
in
the Pacific Northwest (US) where it never really gets hot anyway. Your
mileage may vary. On the big boat referenced above, I found out about
the
SB-112 in time and just said to heck with it ...paid the price for the
stuff
AND added graphite. I'm happy. The smallest kit put 2 coats on the
boat.
Cheap enough for me.

Brian D

"Robert Haston" wrote in message
ink.net...
I remember reading about uv blockers that could be added to epoxy - any
experience?

--
Robert Haston
Satellite Beach, FL





--

That's good to know. It's also a reason to avoid alkyd enamels, even if you
do use a barrier coat primer first. Later on when you do repairs, you'll
want epoxy to stick to the paint so you can do a repair without having to
reprimer and paint the whole durn boat again. Better to do small repairs
until it gets too ugly and THEN primer and paint the whole boat. I'll stick
with LPU's (pardon the pun).

Brian D



"Paul Oman" wrote in message
...
Brian D wrote:

Good point. Can you repair gouges through LPU on top of epoxy by just
applying more epoxy? I mean, will epoxy stick to LPU very well?

Thx,
Brian D


---- Yes LPU coatings are urethane paints after everything is said and
done and
epoxies regularly go over and bond to well adhered paint..

paul




"Paul Oman" wrote in message
...

A two part urethane (LPU) with uv blocker is tougher more gloss
resistant
etc.
than any epoxy it would be covering

paul oman
progressive epoxy polymers


Brian D wrote:

The other answers are not quite correct ...they are true but are also
missing some info. Look at the bottom of my boat at
http://www.reelboats.com (page through the construction notes and
photos)
and look at the graphite bottom. I put about a teaspoon of graphite
into
each 2 ounces of epoxy AND I used System III SB-112 epoxy. The SB-112
epoxy
was developed for surfboards, no top coat required. It already has UV
inhibitors built in. It's also safe to use on polystyrene and similar
materials without them dissolving before your eyes when you apply the
epoxy.
The only thing that I have to say is that you get best results if you
sand
before putting it on, and don't write on the boat with a permanent pen
before coating with it (it is permanent-pen-phobic as far as I can
tell,
grinz.) I won't tell you about how I found out these two things
...just
put
it on clean sanded epoxy or wood and you'll be happy. Works great.

If you don't want to use the SB-112, then you are pretty much limited
to
a
topcoat such as paint or a good marine varnish with UV inhibitors in
it.
I
don't know of any other UV inhibited epoxy out there. The graphite
alone
is
used by a great many people and I've done it with regular epoxy too,
and
never had it chalk up or get cloudy or otherwise indicate that UV
degradation was occurring. Of course that was only on boat bottoms
here
in
the Pacific Northwest (US) where it never really gets hot anyway.
Your
mileage may vary. On the big boat referenced above, I found out about
the
SB-112 in time and just said to heck with it ...paid the price for the
stuff
AND added graphite. I'm happy. The smallest kit put 2 coats on the
boat.
Cheap enough for me.

Brian D

"Robert Haston" wrote in message
ink.net...
I remember reading about uv blockers that could be added to epoxy -
any
experience?

--
Robert Haston
Satellite Beach, FL





--