BTW Matt, `a little tip:
When you`ve completed sanding an area (e.g overlap edge or corner tape; if you mix up a very small batch of 10% mixed-epoxy and 90% acetone in a jam jar and then whet a paper towel with the mix., wipe it thoroughly over the sanded/roughened areas* following by a quick wipe (just to remove the excess) with a dry paper towel....makes the finished parts look really-nice and tidy and seals the raised/abraded fibre ends to prevent damp ingress. 
*Usual caveats about substrate solvent-compatability apply. 
Nice tip but it's gonna be painted over once it's done but I have some wood parts that currently have 3 coats of epoxy on them (it's amasing the transformation of wood once you get some epoxy on it
*drool*) Once they have been sanded fair I'll be sure to use your tip and then some 2-part polyeurathane varnish for UV protection otherwise the epoxy will only last about 2 months.
I use a 30/70 mix acetone/epoxy on the prepared surfaces to aid penetration (no giggles ladies) especially as I will be bonding onto non epoxy GRP. Then once curing starts I start layering the fiberglass, in this case a 300mm strip followed by a 150mm and then a 100mm.
That'll last a good few years.

I have finished building the daggerboard casing but I have lost the opportunity to fit it now due to the dropping temperature

At least all the areas that were damp before have now been dried out thanks to my trusty heater so I'll be good to go tomorrow
