On Mar 16, 7:46*pm, I am Tosk wrote:
In article ,
says...





On Mar 16, 1:42*pm, 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
in cooler temps.

That is correct. *The longest working times available are only about
a hour or so though, right? *Low temperatures might extend that, but
would also thicken it making it harder to get good penetration of
fabric.

With respect to Paul, who spends a lot of time here on this board helping I
used to get slow cure hardener from Larry at Raka in Florida. I am not sure if
Paul has a similar option.

Did you ever say what it is you are trying to make?


I'm planning on a glider.