SEM 69508 Rust Mort Acidic Compound, Green, 1 pt Bottle

SEM 69508 Rust Mort Acidic Compound, Green, 1 pt Bottle

• SEM 69508 Rust Mort Acidic Compound is a rust converter designed to treat rusted ferrous metal surfaces. It converts existing rust into an insoluble black coating, preparing the surface for body filler, primer, or top coat applications.
• Features:
  • Converts and removes light rust while heavy rust is transformed into a stable, workable substrate.
  • Creates an ideal surface for filler or primer with minimal preparation required.
  • Ready-to-use formula; does not require dilution or mixing before application.
  • Easy-to-apply liquid form in a pint container for smaller repair jobs or touch-ups.
  • Must be top coated; provides insoluble black coating when properly applied and fully dried.
• Specifications:
  • Manufacturer: SEM Products
  • Part Number: 69508
  • Color / Finish: Green liquid
  • Container Type: One pint bottle
  • Active Ingredient: Phosphoric acid
  • Recommended Coats: Three to four thin coats
  • VOC Content: Approximately 173 g/L actual VOC less exempt compounds
  • Dry Time: Allow final coat to dry fully before applying filler, primer, or top coat (approximately 24 hours)
  • Suitable Substrates: Rusted ferrous metals
  • Quantity: One pint bottle
• The Rust Mort Acidic Compound may also be referred to as SEM 69508 Rust Mort, SEM Green Rust Mort Pint, Rust Conversion Compound Pint, SEM Phosphoric Rust Converter, and Rust Mort Green Liquid.

SEM Rust Mort 69508 is a professional-grade rust conversion treatment that transforms rust on ferrous metal into a stable black coating. Intended for use before filler, primer, or paint, it simplifies surface preparation for durable finishes.

Q: How many coats are needed?
A: Three to four thin coats are recommended, keeping the surface wet until rust is fully converted for best performance.

Q: Do I need to sand before applying?
A: Remove loose scale and excess rust first. Do NOT sand down to bare metal; Rust Mort is intended to convert rust. After treatment, excess material must be rinsed off and surface fully dried before overcoating.

Q: Can filler or primer be used directly over treated surface?
A: Yes. Once the treated surface is completely dry and free of residual Rust Mort, body filler or primer may be applied according to their respective preparation and adhesion guidelines.