SEM 69504 Rust Mort Acidic Compound, Green, 1 qt Bottle

SEM 69504 Rust Mort Acidic Compound, Green, 1 qt Bottle

• SEM 69504 Rust Mort is an acidic compound that removes or converts rust on ferrous metal surfaces, leaving an insoluble black coating ready for body filler, primer, or top coat applications.
• Features:
  • Converts light rust and transforms heavy rust into a stable substrate.
  • Creates a surface suitable for filler, primer, or top coat use.
  • Ready-to-use formula that requires minimal surface prep beyond removing loose scale.
  • Green color for visibility during application.
  • Requires multiple thin coats rather than a single heavy coat for best results.
• Specifications:
  • Manufacturer: SEM Products
  • Part Number: 69504
  • Color / Finish: Green liquid
  • Container Type: 1 quart bottle
  • Active Ingredient: Phosphoric acid
  • Recommended Coats: 3-4 thin coats
  • VOC Content: approx. 173 g/L (actual VOC less exempts)
  • Cure Time: Allow final coat to dry (~24 hours) before over-coating or applying filler/primer
  • Suitable Substrates: Rusted ferrous metal surfaces
  • Quantity: One quart bottle
• The SEM Rust Mort compound may also be referred to as SEM 69504 Rust Mort, Rust Conversion Acidic Compound Green, Rust Converter Quart, SEM Phosphoric Rust Treatment, and Rust Mort Green Liquid.

SEM Rust Mort 69504 prepares rusted metal surfaces by converting corrosion into a stable black coating. Designed to improve adhesion and surface stability, this green acidic compound simplifies prep work before filler, primer or paint.

Q: Is it necessary to sand before applying Rust Mort?
A: You should remove loose scale and loose rust, but sanding bare metal is not required. Clean surface and apply thin coats.

Q: How many coats are needed for full rust conversion?
A: Three to four thin coats are recommended. Keep the area wet with Rust Mort until rust is fully converted and rinsed clean, then dry thoroughly.

Q: Can I apply filler or primer directly over Rust Mort?
A: Yes, once the treated surface is fully dry (about 24 hours) and free of excess or non-converted compound. Top coat or body filler can be applied following proper adhesion prep.