Hi,

Would this (link) be up to job when fibreglassing and spray painting?

According to the blurb looks OK. We use THESE at work and, they're nice and light.

i wouldn't buy anything other than a 3M mask.

you'll struggle to get the one you've linked to to seal against your face i imagine.

i have a 3M 6000 series and it's far and away the best mask i've ever used. changable filters too. usually go for about £13 on ebay
tom