Thank you kindly chaps
@ Belgian - The gatehouse is in three main sections, with the block house on top being separate from the two wall sections. These will all get put into separate mould boxes and the silicon gets poured in. I don't have a vacuum chamber but I've been doing it long enough I can get away without one. As for pouring the resin, as long as you take your time ( I also pick out the bubbles with a tooth pick) it isn't a problem.
I don't have the room for a vac chamber at home and unfortunately our boss at work won't spring for one (tight fisted old git who needs to retire
), but having learnt the process at work with the most basic equipment has put me in good stead for home casting.
I also spend some time after the cast has come out cleaning them up (not a lot of work to do actually) and it does make a difference.
cheers
James