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On the chopped straw matting, in my admittedly limited experience it is better to tear it roughly to shape than to cut it.
The raggedy edges can be draped over the corners and used to unite the sections of mat.
This also avoids cut lines which are weak points unless subsequently overwrapped with further matting.
If you're using epoxy resin, Easy Composites do fast and slow hardeners.
I used plastic shot glasses from the pound shop as mixing vessels.
Also coffee stall wooden stirrers as mixing tools.
Better to mix twice in smaller batches than to rush to use resin that's starting to go off.
And the twill weave cloth drapes much, much better, though that's probably more for the actual parts than for the moulds.
I made myself a roller out of bent rod, a turned roller barrel and a file handle.
Roller held on with tight fitting plastic tube on the end of the rod.
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