>
>
> The product is SNAP Undercoating Rubberized and no longer sold.  Contains
> Kaolin, Toluene, Naptha, and propane.

I'm no expert at all (not even an amateur) but:

Kaolin - Clay and inert.

Toluene - Solvent with high vapor pressure, should gas off quickly
(especially in hot weather) unless it's bound to something that releases it
slowly.

Naptha - I think similar properties to toluene..

I would be curious what this product uses for a binder. And I don't see any
rubber materials mentioned.

I would leave the vehicle open and give it a week or two and see if there is
a lingering smell.

Markus
'87 Westy