Rich Hampel wrote:

There are two types of Polyester resin for fiberglass:
1. Laminating resin .... contains wax that comes to the surface when
curing so that the next layer fully bonds ... the wax is an 'air
inhibitor'. Laminating resins will always feel sticky to the touch
because of the wax. This wax is soluable in liquid polyester.
2. Finishing resin ... contains NO wax and when exposed to air while
curing forms a hard surface

What you have is probably finishing resin .... and any contact with wax
will change it.

So, you cant use wax anywhere near a finishing resin or you'll
contaminate it and begin to turn it into a laminating resin ...... but
you can use SARAN to keep it sticking where you dont want it to.

Beg Pardon. I belive you have got it the wrong way round. Last time I
looked at a can of wax in styrene it was to be added to gelcoat or even
laminating resin for the final coat if it was to harden in contact with
air without leaving a tacky surface and was NOT for laminating.

Anyway the OP should just go out and buy a big pack of cheap
PolyPropylene cups. That's 5 or PP in the recycling triangle on the
base. Suitable for nearly all paints ,resins, glues and solvents you are
likely to meet working on boats.

--
Ian Malcolm. London, ENGLAND. (NEWSGROUP REPLY PREFERRED)
ianm[at]the[dash]malcolms[dot]freeserve[dot]co[dot]uk
[at]=@, [dash]=- & [dot]=. *Warning* HTML & 32K emails -- NUL:
'Stingo' Albacore #1554 - 15' Early 60's, Uffa Fox designed,
All varnished hot moulded wooden racing dinghy.