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A Sticky Topic

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johnfireball:
Hi Keith,
      I assume you mean the difference between epoxy and polyester resins. Epoxy when set looks less shiny than dry polyester resin and If you sand dried polyester it will smell like polyester wheras epoxy has a neutral smell and sands different but the smell of polyester never goes away.
John.

joe:
Basically:
Epoxy when used with the same fibreglass as polyester. Is stronger, less prone to cracking and does not shrink over time.

Epoxy generally takes longer to cure, has a set mix ratio and can cure in a vacuum. Poly cure time is dependant on amount of catalyst used and usually comes mixed with styrene which evaporates during curing.

Polyester is smelly and the fumes are bad. Also the catalyst is nasty if not treated with care.

Epoxy is not so smelly and fumes are not a big issue. Repeated exposure to skin can cause an allergic reaction.

Epoxy is expensive, Polyester is half the price.

Poly is fine epoxy is usually better. Depends of the application.

There is also vinyl ester which is a mixture of both. :D

Happy Days:
DAM, I’ve just banged my head on the floor!!!!
I fell backwards off my chair when I saw your avatar Joe!!!

Are you back in the land of the living??
Are we going to see you on the slopes again??
Are we about to enjoy reading your postings on this forum once more??

Welcome home Sunshine!

Oh, and thanks for your info as well :D

K.

joe:
Oops! Sorry Keith.
To answer your questions
I never left
Probably
Hard to say.

It's good to be back :)

Fred:
Ok, so, let's talk about the vinylsthere now  :mrgreen:

Sorry, missed this topic until now, but what Joe said.
And same for epoxy "glue" and resin, is the consistency and work time, other than that, that's the same.

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