Penofil(TM) is a brand-name, not an ingredient. Oil-based stains are highly susceptible to spontaneous combustion, and the manufacturers take care to warn about this on the label.
The real lesson is to "READ (and follow) THE LABEL INSTRUCTIONS.
Safety is the practice of fixed and unbendable principles, the first of which is to be flexible at all times. Paraphrase of Everett Dirksen.
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From: ACS Division of Chemical Health and Safety [mailto:DCHAS-L**At_Symbol_Here**PRINCETON.EDU] On Behalf Of Secretary, ACS Division of Chemical Health and Safety
Sent: Wednesday, July 12, 2017 1:12 AM
Subject: [DCHAS-L] LETTER: Beware of flammable chemical in wood stain, shed caught fire
I think that this is a nice example of a Lessons Learned story related to chemical safety...
LETTER: Beware of flammable chemical in wood stain, shed caught fire Tue Jul 11th, 2017 11:22am OPINION
Last month, our shed burned down, taking with it at least one of our large stately cedar trees. The cause? A chemical ingredient (penofin) in the stain being used on our house.
It turns out that penofin self-combusts in the presence of air, so when our contractor placed one small brush, one empty can and a small rag just outside the shed, eight hours later the fire began. If one reads the very small print about this ingredient (found in several wood stains), the manufacturer details that all tools and containers used to apply the stain are to be placed in a tub of water for a week to avoid combustion.
When I talked with the fire inspector, he informed me that four recent fires he had written investigation reports on had penofin as the cause. When I asked why on earth would such a product be available, he replied that because it is an epoxy (rather than a resin), it does a better job of protecting structures from the elements. Once the product is applied and dry, self-combustion will not happen. We were evidently about 20 minutes away from losing our house and starting a major forest fire on the north end.
The purpose of this communication is to warn residents about the perils of using products with this ingredient and to urge users to follow the instructions carefully. The other fact I have discovered is that not all manufacturers state that penofin is an ingredient in their product, rather placing it under the category ‰??proprietary ingredients.‰??
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