Fiberglass resin instead of spar urethane?

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aeviaanah
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Fiberglass resin instead of spar urethane?

Post by aeviaanah » 29 Sep 2011, 23:00

I got some fiberglass resin laying around....can this be used instead of spar urethane. I will be using it to seal plywood deck, transom and seats.
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jdbassin2003
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Fiberglass resin instead of spar urethane?

Post by jdbassin2003 » 29 Sep 2011, 23:17

Check out this pdf on the topic newboatbuilders.com/docs/fiberglassoverwood.pdf Just copy the link and paste it to your address bar. It's talking about wood boat building but it talks about issues with using resin over wood if water penetrates it.

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aeviaanah
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Fiberglass resin instead of spar urethane?

Post by aeviaanah » 29 Sep 2011, 23:56

Thanks, good read! Seems like spar urethane would do the same.
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J.P.
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Fiberglass resin instead of spar urethane?

Post by J.P. » 30 Sep 2011, 02:41

are you talking about epoxy or polyester resin? i'm asking since both are used with fiberglass. but the polyester doesn't work as good as epoxy when sealing wood. also, uncoated epoxy and polyester are susceptible to UV damage, so you would still have to protect it from exposure by painting over the surface or using clear varnish in case you want to show a natural wooden finish.

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Fiberglass resin instead of spar urethane?

Post by Captain Ahab » 30 Sep 2011, 05:42

I used a 2 part epoxy sealer and it worked very, very well

http://www.overtons.com/modperl/product ... rchID=4005
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aeviaanah
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Fiberglass resin instead of spar urethane?

Post by aeviaanah » 30 Sep 2011, 22:30

J.P. wrote:are you talking about epoxy or polyester resin? i'm asking since both are used with fiberglass. but the polyester doesn't work as good as epoxy when sealing wood. also, uncoated epoxy and polyester are susceptible to UV damage, so you would still have to protect it from exposure by painting over the surface or using clear varnish in case you want to show a natural wooden finish.
Not sure what kind of fiberglass resin it is. It just says fiberglass resin on the front. When you say clear varnish do you mean spar urethane?
Captain Ahab wrote:I used a 2 part epoxy sealer and it worked very, very well

http://www.overtons.com/modperl/product ... rchID=4005
Right on, i do have a gallon of two part epoxy. It is black...id like to have the strength of epoxy with the finish of wood...whats the best way to do that?
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Mojo^
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Fiberglass resin instead of spar urethane?

Post by Mojo^ » 02 Oct 2011, 17:53

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Fiberglass resin instead of spar urethane?

Post by Mojo^ » 02 Oct 2011, 17:58

aeviaanah wrote:Right on, i do have a gallon of two part epoxy. It is black...id like to have the strength of epoxy with the finish of wood...whats the best way to do that?
Take a look at the epoxy resins at U.S. Composites. It is tough as nails and is clear. I used the 635 medium resin on my transom. It's easy to work with and is very, very strong.

http://www.uscomposites.com/epoxy.html

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Fiberglass resin instead of spar urethane?

Post by Captain Ahab » 02 Oct 2011, 19:51

The 2 part epoxy I used is clear
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Fiberglass resin instead of spar urethane?

Post by J.P. » 02 Oct 2011, 22:47

aeviaanah wrote: When you say clear varnish do you mean spar urethane?
there are many types of varnish.
for sealing wood, you are better off with spar.
for protecting epoxy from UV damage, acrylic varnish will work better.

aeviaanah wrote: Right on, i do have a gallon of two part epoxy. It is black...id like to have the strength of epoxy with the finish of wood...whats the best way to do that?
many kinds of epoxy. the black epoxy you have probably has filling agents (like steel epoxy). what you need for sealing wood is laminating epoxy. it's clear and has low viscosity. it seeps into the wood grain, and cures to a nice wood stain color. you must coat this over with acrylic varnish to protect from long term UV exposure.

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aeviaanah
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Fiberglass resin instead of spar urethane?

Post by aeviaanah » 02 Oct 2011, 23:35

Mojo^ wrote:
aeviaanah wrote:Right on, i do have a gallon of two part epoxy. It is black...id like to have the strength of epoxy with the finish of wood...whats the best way to do that?
Take a look at the epoxy resins at U.S. Composites. It is tough as nails and is clear. I used the 635 medium resin on my transom. It's easy to work with and is very, very strong.

http://www.uscomposites.com/epoxy.html
Thanks for the link!
Captain Ahab wrote:The 2 part epoxy I used is clear
Oh ok, i wasnt aware they had it in clear.
J.P. wrote:
aeviaanah wrote: When you say clear varnish do you mean spar urethane?
there are many types of varnish.
for sealing wood, you are better off with spar.
for protecting epoxy from UV damage, acrylic varnish will work better.

aeviaanah wrote: Right on, i do have a gallon of two part epoxy. It is black...id like to have the strength of epoxy with the finish of wood...whats the best way to do that?
many kinds of epoxy. the black epoxy you have probably has filling agents (like steel epoxy). what you need for sealing wood is laminating epoxy. it's clear and has low viscosity. it seeps into the wood grain, and cures to a nice wood stain color. you must coat this over with acrylic varnish to protect from long term UV exposure.
Thanks for the information, ill be sure to go and pick some up tomorrow.
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