On Sun, 21 Mar 2010 17:16:00 -0400, I am Tosk
wrote:

In article , keillorp135
says...

On Sun, 21 Mar 2010 12:10:58 -0400,
wrote:

In article , keillorp135
says...

On Tue, 16 Mar 2010 13:42:41 -0400, Paul Oman
wrote:

wrote:
On Mar 14, 12:31 pm, Paul Oman wrote:

wrote:

Two questions for people with knowledge or experience with the UV
curing polyester resins:

1) Are they (any of them) compatible with polystyrene foam?

2) Once the UV light has initiated the polymerization, will it spread
through the layup even into places where the light did not
penetrate? I'm thinking, for instance about the underside
of carbon fiber cloth.

Thanks.

--

FF

it makes more sense to use thermo set epoxies. Stronger, better bond,
probably cheaper.
epoxies will not dissolve foam


Thermo set meaning that they don't begin to cure until they are
heated?
I ask because I am looking for a very long working time.

If so, do you have a recommendation?

Otherwise, can you answer the first question? I was quite aware of
the
other issues.

----------------------
thermo set means a chemical reaction between parts a and b and these
reactions produce heat. This is how epoxies work. You can get slow
epoxy curing agents and you can also slow down the reaction by working

I think I get it. In simple terms can I assume parts or molecules of
resin that are not activated by the correct molecules of activator, will
just stay resin and never really "harden" (for lack of a better term)?

Pretty much. More likely, the molecule would be reacted on one end
and not the other. Reaction kinetics will usually favor one end
reacting first. The end result is lower crosslink density, unreacted
groups, and less than full development of cured properties.

Pete Keillor