Any polymerization reaction is likely to be exothermic, and with the heat
contained as well as it is by fine dust or a tightly twisted rag, stuff can
happen. You're not safe because it's not linseed.

I'd let any finish cure well before sanding, even a "sanding sealer," which
is normally a thinned version of a finish.

"Gfretwell" wrote in message
...
Linseed oil is notorious for combustion, maybe you had some of that in
there.