This is a fact. Spontaneous combustion can and will happen with linseed oil products. I have seen it happen twice. Especially when driers have been added to the oil. On a jobsite you must have a metal can filled with water to put used rags in. When doing stain work on new homes I would NEVER leave used rags in a house. I might leave them in the yard away from the house for a few days. Never bunched up. Once on a commercial job I told a subcontractor he must not leave used his used rags on the premises overnight. The idiot hid them in a pile behind something, I don't remember where. 5 am I get a call, the jobsite is ablaze. Fire marshall determined the rags were the cause. $1,000,000 damage. $200,000 of it was drawn from MY liability insurance. I was very angry at that monkey head. Another time I saw it cause a dumpster fire on a commercial job. NEVER leave any rags with oil products of any kind without a proper disposal.BLO is combustible. An oil saturated rag is how my business burned down. Never keep a rag that has been used for oil.
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