We use automotive engine spray paint out of the can. We periodically touch up areas such as behind the oil or transmission coolers when we change or service them. If I have a bolt head, I'll spray into a empty yogurt container and use a Q-tip as a brush. The big down side to spray paint is the prep to protect the surrounding areas from the over spray plus the fumes from a health and safety standpoint. Our SP135 has ~8k hours on her.
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