Building on what has already been said, when doing complicated work (internal corners and double curvature) with a stiff brush and stippling, work progressively across the part in rows working side to side so you don't disturb the areas you've already worked on, take your time and do some test pieces with different catasyst ratio's to see how much working time you have. Complex parts need more working time so try 1% by weight with poly resin rather than 2%.
I bent a bit of aluminium into an L-shape, put a few layers of release wax on it then 450csm and practiced until I got the hang of it without wasting any moulds I've made. You need to make sure the csm is fully wetted out and the bonding agent has disolved before you work it properly
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