ONE of the more common questions we get asked about the Biostrip range is - what's it like on metals?

The short answer is that its great on metals; Biostrip will strip a wide variety of paint finishes, including fusion-dried powder coats, tricky stuff like Hammerite paints and two-pack epoxy's, as well as modern water-based automotive-type paints (especially the notoriously difficult-to-strip two-pack water-based auto finishes.)

There are two ways of approaching  this job.

Firstly Biostrip 20 can be used. Simply brush the product on to the metal, wait until the paint has blistered or softened, then wash or scrape it off.

Or, for Industrial or large applications, Biostrip 42 Immersion Stripper can be used. As the name suggests, this product is for use in immersion tanks. It should be heated to around 25 C and the metal parts submerged.

  • Normally at temperatures above 25°C, a single coating of fusion-cured powder epoxy paint will take about 20 minutes to strip
  • Water-based two-pack automotive paints can strip in as little as 10 minutes, depending on the paint type and thickness
  • Really difficult coatings, such as MOD Nato-type paints, or things like Caterpillar yellow (used on diggers, etc) can take a bit longer, but usually no more than an hour
  • A typical domestic radiator with two coats of paint, a water-based electrocoat primer with a fusion-cured powder topcoat, normally takes about 20 minutes to strip both coats


IT'S easy to see when the paint has stripped from the parts as it blisters away from the metal surface in large sheets, which drop away from the part as it is removed from the Biostrip, or is easily washed off with water, eg, from a hosepipe.

Once the part has stripped, it needs rinsing with water to remove any residual stripper, as this would cause future paint applications to blister when applied.