Other than microbial attack, the other primary way that biodiesel fuel would “go bad” is through oxidative damage. If your fuel has already been attacked by a microbial outbreak, we recommend that you use a stronger biocide such as KILLEM.Non-oxidising biocide test kits for isothiazolone, THPS and DBNPA will measure levels of biocide in open and closed water systems and can be used when dosing biocides to systems recently pre-commissioned cleaned.WOODguard® contains several transparent ultra violet (UV) blocking pigments, which protect the finish from damaging ultra violet rays and improve water repellency. WOODguard® oil formula provides long-term protection and water repellent by penetrating deeply into the wood. WOODguard® is a highly durable one coat, oil-based, transparent, wood preservative stain designed for log homes and siding.