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On the fibreglassing, for what its worth, these are my findings ...
I find it best to tear chopped strand matting rather than cut.
It leaves a feathered edge which is much easier to blend with adjacent pieces.
Precise sizing of the pieces also becomes less necessary. In fact they can often be quite random.
And crucially, in a structural part at least, you aren't creating loads of short strands in the matrix, which would weaken it. Though that's not so important in a mould perhaps.
Tearing the pieces makes the bonding between adjacent sections of mat much better, without relying solely on overlap of subsequent pieces.
I might cut in certain areas, when trying to eliminate voids in tight, internal corners for example, but even then I would only cut the first layer or two.
And finally .. it means that you can use up all your odd offcuts.
Are you using a roller ?
I made one out of a bit of bent stainless rod, an old file handle and a turned, ridged roller, held on by a piece of neoprene tube fitted tightly over the end of the rod.
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