This is probably dull for any reader out there, but I just wanted to keep track of materials used for the tunnel top.
I mixed 300g of resin and 90g of catalyst at 40C (I put the mixing pot in a simple ban-marie), and then put it in the degassing chamber for 20 mins – it hadn’t finished but I was paying attention to the fact that I had the resin quite a bit hotter. It’s definitely like runny soup at this temp. Interestingly when you mix the resin at temperature, it degasses naturally much quicker, so there was a lot less foaming in the chamber – just some polite bubbling.
So, after the infusion, I had 45g of resin left. I’d also left the tap open for 30s after I’d closed the vacuum (a Warren tip) to make the part slightly resin rich to enable a better facing surface, and to have a slightly thicker layer in case I want to do a little polishing.
My rough calculations are that I’ve used are:
So, crudely 550gsm (in two layers, which means more holes) consumes 1.06KG of resin, per msq. The actual weight of the remaining part will be a lot less than that. The larger the part, the smaller the ratio of resin wasted in consumables.