Originally Posted by johannlochner
Yeah, the volume is about 25 cubic litres
so, the rest has to be sand/glass and gel coat!
It is quite a lot...
I don't quite know how to get around the inflation/clamping without squaring it off.
Then there is the warping and twisting issues too...
Excuse my ignorance (following this thread with great interest)
Presumably, having completed the mould face
- You're back-filling the "b-side" with sand/glass/resin for strength againt the bladder/clamping pressure?
- Wouldn't it be possible to substitute a form of concrete - for instance glass-reinforced-concrete (GRC) as the backfill.
- I appreciate that concrete itself would probably not have the required tensile strength without some kind of reinforcement, but GRC is widely used in the construction industry for lightweight cladding etc For example see ... http://www.grcuk.com/