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Not sure, certainly MDF leaches formaldehyde but that's a different subject. I think the solvent stuff evaporates and clears quite quickly. I always try to avoid grip fill et al primarily because it's difficult to dismantle.
I get headaches at night if I've been using these materials all day, I never used to but I've used a solvent filter mask for the last 5 years to avoid the problem. Occasionally I forget and have a really pleasant day, high on fumes. The ones to look out for are the heavier than air fumes that you get with some spray thinners, they hang around for weeks.
Good advice! I may well use it still but get some wipes. Is there any evidence that this kind of stuff is bad for health long-term, in a sick house syndrome kind of way?