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[Spencnaz]

Yeah, having paint dissolved in biodiesel is never a good thing. I use a 275 gallon plastic tote with reinforcing bars on the outside for biodiesel storage.

The filter MIGHT catch all that paint residue, but think of this, what about the solvents in the paint that are dissolved chemically now into the biodiesel?

Stainless steel is the best, but if you can find a clean 55 gallon drum free of rust and scale on the inside (no paint either) then you should be ok. Keeping the biodiesel sealed from moisture, light and oxygen will help keep it fresh for quite a while.

I've been nitrogen inerting my tanks when I can't use the biodiesel for a long time. The nitrogen displaces the air in the tank, keeping oxygen from any bacterial growth from starting.

On your other note, yeah a lot of people do confuse WVO/SVO use with biodiesel. It's not their fault though, there is a lot of confusion out there about alternative fuels and TV shows only barely scratch the surface when it comes to any details about biodiesel.

I know of one show on Dirty Jobs, that probably left way more questions than answers. Of course they have to edit for time, but a lot of people don't bother to dig into the specifics of the subject and end up burning themselves with costly failures.