Haha, sorry, I didn't realize we were still in the thread about a carrier deck...

Yeah, for sure, I just think it's important to understand the reasons behind the safety precautions. That way when novel situations arise, one can make wiser, more informed decisions.

The three types of oil I described all have different safety concerns. Solvents actually cool as they evaporate, but they can make explosive vapors that could concentrate in enclosed areas. Motor oils don't really really react much at all and need to absorbed and contained quickly. And oxidizing oils react with oxygen exothermically and potentially contain heavy metal drying agents that accelerate the process.

I work with all types of paints and finishes in woodworking and metal working, as well as heavy equipment maintenance, and I just think it's important to understand the differences. A greasy rag soaked in engine oil and hydraulic fluid is very different than a rag soaked in linseed/tung oil based deck oil full of Japan drier and mineral spirits. Of course, neither should be left around in piles, but for different reasons.

What's an OBD?

No, definitely not thinners or mineral oils. It's polymerizing oils. Thinners and solvents are just pure VOCs that evaporate which is cooling. Mineral oil and motor oil type oils don't do anything. It's the drying oils like linseed oil, varnish, polyurethane, etc. Those oils absorbe oxygen and polymerize as part of their curing process in an exothermic reaction. My preferred way to dispose of them is to leave them is to seal them in the empty cans after I oil a deck. I have had spontaneous combustion twice oiling decks in the sun on hot July days. A single balled up rag soaked in Penofin in the sun started smoldering.