Ok as Garfie cant let on his source and he probably does not know what he is referring to anyway and probably picked up the glassing issue from my signature then I will share what i did wrong anyway as those who know me know if have nothing to hide....
ok a couple of the mistakes i made that hopefully you wont repeat if you need to do glassing
rub down any flo coat to remove any waxy layer that come to the surface as it sets, this will give the new glass/flocoat a good foot hold
keep the glass resin or flocoat reasonably warm, ie not stone cold or minus temp
keep it all dry and out of the rain while it sets and is still "green"
let water mix in iwth the resin or the glassfibre mat get wet while applying
dont let the mix get tooo cold if doing outside as it will take an age to set
dont glass in the rain!!
mistakes i made
when putting some extra boarding in the console base for the first bit i did it outside in the cold and expected the hardener to do its work but it took ages to set, also i may have swished in a bit of water into the glass fibre by mistake as it was wet outside or the constant rain just got onto the resin and caused the problem that way, trying to catch up on time and doing it outside at midnight is not the best option. Luckily i had only done the first of 4 bits.
so when it set there were patchs that were soft from the water and mike explained that it just wont set ever so i took it all out, cut away all the new resin, re prepped the surface, then put a heater in the console, re glassed in some resin treated marine ply and allowed it to dry in a warm dry environment which had a fan blowing on it as well with some gentle heat. then i flo coated over the top after all had set nicely and the jobs a good un.
as i have had to work outside it has been a bit tricky but a halogen heater with a fan dispersing the heat around and keeping the temp to around 20-25 degrees works wonders
all the other glassing i have done has been inside in the warm so that is the best place believe me!!
Hve done quite a few bits more glassing since and it is going well so hopefully you wont make the mistake i did initially.
oh and ps, i havent cut any holes too big as originally mentioned by garfie!! well not yet anyway!!