Can blue board be glassed with polyester resin?

[therigwelder]

Can blue board be glassed with poly?

[lewisboats]

I am assuming you are talking about extruded poly styrene from Home Dumpo or Lowe-st...no. Polyester will melt the styrene into goo. You would have to use epoxy for that.

[ondarvr]

There are some polyesters that will work, but you need to special order it.

[lewisboats]

Originally Posted by ondarvr

There are some polyesters that will work, but you need to special order it.

I would expect that they would cost close to the same as epoxy so I don't see the benefit.

[tropicalbuilder]

i've been able to use poly over styrofoam priming the styrofoam with white glue.
The vinil based white glue used by carpenters for wood.
As my foam was white i put some black pigment in the glue so to be able to see any void while painting.
I also found that it is better to prime with one coat of resin, let it set and then go on with the laminations.

[Herman]

Originally Posted by lewisboats

I would expect that they would cost close to the same as epoxy so I don't see the benefit.

You can apply a layer of the special polyester, and after cure laminate further with normal polyester. That is the benefit.

[ondarvr]

Originally Posted by Herman

You can apply a layer of the special polyester, and after cure laminate further with normal polyester. That is the benefit.

Correct, and the cost is less than epoxy.