I am no fibreglass expert but have built my own kayak with the stuff and rebuilt two f'glass bodied cars and done lots of kayak / canoe repairs; I was advised that, if using Polyester resins, they of the 2.5 - 5% Methyl Ethyl Ketone Peroxide (MEKP) catalyst, that the lovely smell is styrene fumes.
If you are doing a reverse layup (i.e. not in a mold) then when you have laid your last chop strand / cloth and wetted it out, when it goes like cheddar cheese (that state when you can slice the fringes with a Stanley knife without tearing the strands apart), then coat the entire thing in a skim of good body filler - the syrene bleeds through that as well and somehow you get a chemical bond (not just the usual mechanical one).
I tried using tissue aka veil (ultra fine chopped stand) on the rebuild of the Lotus door but that was ugly to use - it seem to lift with the brush when stippling the resin on as it wetted out and sort of went like candy floss in places - I 'bogged' over that before it was hard and had a really nice finish to sand down. Didn't use veil but did do the cheesy bog step with the gravity racer.
