Hi Alan
Not wanting to disagree with HS93 - Peter - but, I have used Z-Epoxy finishing quite a lot. I find that I have between 15-20 minutes working time from it, if it is mixed correctly.
Where I disagree with Peter, is, if you pour the resin on top of the cloth - you will trap air underneath the cloth and it will be very difficult to remove it. Apply the Epoxy first onto the hull and then lay the cloth over the top and work the resin through the cloth. Only do once section at a time - do one side, then do say half a side along the keel and this way it gives you ample time to work the Epoxy resin through the cloth. You have no need to wait until the Epoxy goes 'off' before you move onto the next.bit.
I have included 2 pictures of the RTTL hull, this has 3 coats of Z-Epoxy on it; first 2 coats were rubbed right back and the 3rd coat gives the finishing coat.
There is no cloth involved in this, as the hull construction is double-diagonally planked.
I do hope this helps.
aye
john e
bluebird