KBS RustSeal and POR-15 are the two most trusted rust-encapsulating sealers in the world. Both bond directly to rusted metal and cure into a rock-hard, moisture-proof shell. So which should you use? Here's an honest comparison.
How they're similar
Both are moisture-cured coatings that actually get harder when exposed to humidity, both seal rusted metal so corrosion can't continue, and both are far tougher than ordinary enamel. For most jobs, either will give you a result that lasts decades.
KBS RustSeal — the system approach
KBS is built around a complete 4-stage system — RustBlast prep, RustSeal, then BlackTop or topcoat. RustSeal self-levels beautifully (fewer brush marks), and the matched prep products make surface preparation foolproof.
POR-15 — the original
POR-15 is the coating that started the category and has a loyal following for chassis and fuel-tank work. Its prep system (Cleaner Degreaser + Metal Prep) is excellent, and the cured film is exceptionally hard. Shop POR-15 →
The verdict
- Choose KBS if you want one matched system with the easiest prep and a self-levelling finish.
- Choose POR-15 if you're already a fan or doing classic chassis and tank restoration.
One important note for both: always topcoat if the surface sees sunlight — neither is UV-stable on its own.
Shop genuine KBS, POR-15, Brunox & RAPTOR — in stock in Australia with fast freight.
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