I'm really sick of statements containing "probably" or "I think" in threads about biodiesel production.
It's chemistry. Chemistry is science. It is not subjective or open to interpretation.

Also, all the FUD about blowing up your house is ridiculous. People have gasoline-fueled cars in their garages and highly-caustic drain cleaner under their sinks, and nobody freaks out about that. Everything is dangerous; that's why we have precautions and procedures for doing the most dangerous of the things we do.

Tl;dr - not knowing is not the same as knowing not, and fear is not the same thing as caution.

/soapbox