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trying to avoid specialised marine
products until I actually get around to doing a proper sort out of the engine bay as it tends to make the price of things triple.Obviously the less likely it is to catch fire the better but it’s a good half metre above a well vented engine, which runs around 70-100, so quite low down the list of fire risks compared to gas, MF stove + the number of cigarettes I smoke etc.
If it's on a boat, near a heat source, I'd consider looking for proper marine insulation boards. Fire risks in enclosed spaces...