Glass over shaped foam

luminary

Anarchist
714
54
Hi all,

I'd like some advice on building a temporary float/bouy. My plan is to build the structure then surround with foam, shape then cover with glass and resin. This is not expected to be long lived or pretty. Just need it to be relatively easy to build and effective. I was planning to use the 1" insulation foam boards (Home Depot). I'm just not sure if the polyester resin will melt the foam and/or not adhere at all. Is there a foam I should use (without going to clegcell(sp?) etc).

thx

l

 

mrgnstrn

Super Anarchist
1,375
4
Herring Bay, MD
Hi all,

I'd like some advice on building a temporary float/bouy. My plan is to build the structure then surround with foam, shape then cover with glass and resin. This is not expected to be long lived or pretty. Just need it to be relatively easy to build and effective. I was planning to use the 1" insulation foam boards (Home Depot). I'm just not sure if the polyester resin will melt the foam and/or not adhere at all. Is there a foam I should use (without going to clegcell(sp?) etc).

thx

l
I have heard that poly resin does melt most insulation foam.

reference:

http://www.eskimo.com/~leftcst/iWeb/Left_Coast/The_pram/Entries/2007/10/28_Kicked_out..html

I have also heard that epoxy doesn't:

reference:

http://www.westsystem.com/ss/the-lost-foam-method-of-composite-fabrication/

-m

 

luminary

Anarchist
714
54
Hi all,

I'd like some advice on building a temporary float/bouy. My plan is to build the structure then surround with foam, shape then cover with glass and resin. This is not expected to be long lived or pretty. Just need it to be relatively easy to build and effective. I was planning to use the 1" insulation foam boards (Home Depot). I'm just not sure if the polyester resin will melt the foam and/or not adhere at all. Is there a foam I should use (without going to clegcell(sp?) etc).

thx

l
I have heard that poly resin does melt most insulation foam.

reference:

http://www.eskimo.co...icked_out..html

I have also heard that epoxy doesn't:

reference:

http://www.westsyste...te-fabrication/

-m
Ah-ha. Thanks that is probably all I need to know.

thx

 

mad

Super Anarchist
Hi all,

I'd like some advice on building a temporary float/bouy. My plan is to build the structure then surround with foam, shape then cover with glass and resin. This is not expected to be long lived or pretty. Just need it to be relatively easy to build and effective. I was planning to use the 1" insulation foam boards (Home Depot). I'm just not sure if the polyester resin will melt the foam and/or not adhere at all. Is there a foam I should use (without going to clegcell(sp?) etc).

thx

l
I have heard that poly resin does melt most insulation foam.

reference:

http://www.eskimo.co...icked_out..html

I have also heard that epoxy doesn't:

reference:

http://www.westsyste...te-fabrication/

-m
Ah-ha. Thanks that is probably all I need to know.

thx
You can also melt polystyrene with epoxy if you apply to much material or large amounts of filler. The heat can build up quite quickly.

 

luminary

Anarchist
714
54
Hi all,

I'd like some advice on building a temporary float/bouy. My plan is to build the structure then surround with foam, shape then cover with glass and resin. This is not expected to be long lived or pretty. Just need it to be relatively easy to build and effective. I was planning to use the 1" insulation foam boards (Home Depot). I'm just not sure if the polyester resin will melt the foam and/or not adhere at all. Is there a foam I should use (without going to clegcell(sp?) etc).

thx

l
I have heard that poly resin does melt most insulation foam.

reference:

http://www.eskimo.co...icked_out..html

I have also heard that epoxy doesn't:

reference:

http://www.westsyste...te-fabrication/

-m
Ah-ha. Thanks that is probably all I need to know.

thx
You can also melt polystyrene with epoxy if you apply to much material or large amounts of filler. The heat can build up quite quickly.

thx. I'll start slow with the layering. It needs to be light duty so I wont be caking it on anyways.

 

BalticBandit

Super Anarchist
11,114
1
Hi all,

I'd like some advice on building a temporary float/bouy. My plan is to build the structure then surround with foam, shape then cover with glass and resin. This is not expected to be long lived or pretty. Just need it to be relatively easy to build and effective. I was planning to use the 1" insulation foam boards (Home Depot). I'm just not sure if the polyester resin will melt the foam and/or not adhere at all. Is there a foam I should use (without going to clegcell(sp?) etc).

thx

l
I have heard that poly resin does melt most insulation foam.

reference:

http://www.eskimo.co...icked_out..html

I have also heard that epoxy doesn't:

reference:

http://www.westsyste...te-fabrication/

-m
Ah-ha. Thanks that is probably all I need to know.

thx
You can also melt polystyrene with epoxy if you apply to much material or large amounts of filler. The heat can build up quite quickly.

thx. I'll start slow with the layering. It needs to be light duty so I wont be caking it on anyways.
You can also protect the foam from melting by layering some Elmers glue all over it. Or some spray latex. Downside is that you don't have a tight bond to the inside foam, but if that's not a problem, its cheaper than using Epoxy.

 

Oxygen Mask

Super Anarchist
6,214
1
Oregon USA
Hi all,

I'd like some advice on building a temporary float/bouy. My plan is to build the structure then surround with foam, shape then cover with glass and resin. This is not expected to be long lived or pretty. Just need it to be relatively easy to build and effective. I was planning to use the 1" insulation foam boards (Home Depot). I'm just not sure if the polyester resin will melt the foam and/or not adhere at all. Is there a foam I should use (without going to clegcell(sp?) etc).

thx

l
One coat of leftover latex house paint is all you need. Interior or exterior, doesn't matter. (Doesn't everyone have a partial gallon in the shed?)

After one coat, the foam will still be plenty rough enough for the resin to stick to it. (Especially if you didn't try to sand it smoother than say, 120 grit. You can't get foam all that smooth anyway no matter how hard you try.)

Don't use the 'pressed beads' foam, use the extruded (smooth) stuff. Still cheap enough, but Far better stuff and longer lasting too. Epoxy won't eat it ( but poly sure as hell will!)

Paraffin? Will polyester resin cut that?
Nope, but it's hard as hell to glass something that the resin/cloth refuses to stick to.

 

GnD

Super Anarchist
1,018
0
spray the foam with a water based sand and fill auto paint. it will not eat it. the Polyester or Epoxy will not eat it. We have used it for down and dirty proto for years. Plus you can use WAX. Dental wax sheets are GREAT. This way you can control the thickness of your lay ups. just put on the sheets as needed.

 
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