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comparative costs of polyester and epoxy laminates?
interestedparty - 7/8/10 at 04:22 PM

Im looking at doing some bodywork bits myself, and would like to use epoxy instead of the usual polyester. Main reason is the polyester is too smelly (might not get away with it )but the extra strength of epoxy would be good as well. I've even wondered about ising glass cloth instead of mat.

I know epoxy is quite abit dearer than polyester, but Im wondring if anybody happens to know how much dearer it is (on average).

I will be looking up some prices anyway, but there's lots of people here who know lots of stuff, so thought I would ask anyway


PSpirine - 7/8/10 at 04:29 PM

I think it's something like 4-5 times the cost (or at least was when I was looking around a while back) i.e. A LOT!


balidey - 7/8/10 at 04:31 PM

epoxy is nasty stuff to work with


interestedparty - 7/8/10 at 04:35 PM

quote:
Originally posted by balidey
epoxy is nasty stuff to work with


In what way? I've worked with it before and not had a problem, better than polyester in my opinion (no styrene fumes)


v8kid - 7/8/10 at 04:55 PM

Skin rot.

Watch for old stock when it crystallizes

Cheers


MakeEverything - 7/8/10 at 04:56 PM

Ive often wondered if epoxy resin and a normal fibre cloth would work at all?

Kevlar cloth is relatively cheap, as is glass fibre cloth.


interestedparty - 7/8/10 at 05:08 PM

quote:
Originally posted by v8kid
Skin rot.




I always wear gloves if Im doing anything like that, but I will watch out


quote:
Originally posted by MakeEverything
Ive often wondered if epoxy resin and a normal fibre cloth would work at all?





It certainly does, I've done it myself many years ago, making cowlings for helicopter engines etc.


v8kid - 7/8/10 at 06:09 PM

Don't you have to use a powder coated fibre? It's so long ago I forget but there is summat about that.

cheers


iank - 7/8/10 at 07:32 PM

You can suffer from a severe allergic reaction to epoxy if you're sensitised to it. Once sensitive you can't even go near the stuff without much unpleasantness. Different people sensitise with different exposures, some on first exposure, some take many years. See http://www.fram.nl/workshop/controlled_vacuum_infusion/allergy.htm for gory details

For relative costs
Polyester is around £17 for 5kg
Epoxy £84 for 6kg

Both prices from http://www.cfsnet.co.uk/


Neville Jones - 7/8/10 at 08:11 PM

The smell of the styrene in poly resin pales into insignificance to the degree of the extremely high carcinogenic nature of the epoxy hardeners. How do I know?? You guessed it.

Stick with poly or vinylester resin, and put up with the smell, or put a big fan in the window, blowing outwards.

Cheers,
Nev.


interestedparty - 7/8/10 at 09:10 PM

I note that there are dangers with epoxy, but can't help wondering why the stuff is still made, and why so many people seem to work with it without wearing full positive pressure body suits.


alistairolsen - 8/8/10 at 07:59 AM

Epoxy as said is just as nasty and somewhat worse.

Its about 4-6 times the price depending where you go.

You cant use it with chopped strand matt, there is no styrene to dissolve the emulsion that binds it.

youll never lay up a nosecone or suchlike with cloth unless youre very good with laminates.


interestedparty - 9/8/10 at 05:38 PM

quote:
Originally posted by alistairolsen


You cant use it with chopped strand matt, there is no styrene to dissolve the emulsion that binds it.

youll never lay up a nosecone or suchlike with cloth unless youre very good with laminates.



That's a very good point.


Anyway, I've discussed it with the powers that be, and it's been decided that I can do it with conventional polyester resin.