Thanks JP. Appreciate your input.
I mixed the epoxy before reading your mail for the sealing coat, and needless to say mixed too much ! I have a better idea now of how this product covers, so hopefully will be okay.
I'm using SP epoxy with a slow set hardener...and it really is slow, as it took three hours to go off....which bodes well for the glassing process.
If the first coat is fully cured this evening I'll apply the filler coat of epoxy/microballoon mix. Not much filling to do actually, but it will allow a good surface preparatiojn for the glass cloth application over the weekend. Thats the plan anyway