3M Platinum Select Filler — 1‑Gallon Lightweight Body Filler, Stain‑Free Creamy Formula

3M Platinum Select Filler 31131 is a lightweight, super-creamy body filler that spreads easily, resists staining and tackiness, and reduces primer use on automotive and industrial repairs.

Built to speed collision and cosmetic repairs, this premium 3M filler combines a resin-rich formulation with excellent adhesion to metals and composite substrates. It reduces pinholes and produces a fine finish that cuts primer material and sanding time. Available as a 1-gallon unit and in 276 mL cartridges for the 3M Dynamic Mixing System, it’s formulated for professional, industrial use where consistent results matter.

How does this filler reduce primer and prep work?

The creamy texture produces a very smooth surface that minimizes micro-pinholes and high spots, meaning less primer is needed to achieve full coverage and adequate film build. The refined finish lowers sanding profile requirements, so shops spend less time on abrasive steps.

• Reduces primer consumption by up to 30% on average
• Creates a dense, fine-grain surface that sands evenly
• Minimizes micro-pinholes for better topcoat appearance

What surfaces and substrates will it adhere to?

This filler bonds strongly to a wide range of substrates commonly found in collision repair and industrial work. Its resin-rich chemistry allows adhesion to galvanized steel, aluminum, E-coat, SMC, FRP and even cured 2K epoxy and urethane primers, lowering the risk of delamination.

• High adhesion to metals and coated substrates
• Compatible with cured epoxy and urethane primers
• Works on molded composites like SMC and FRP

How does the formula make application and finishing easier?

The product’s super-creamy, tack-free consistency mixes and spreads with minimal effort, filling dents, dings and gouges cleanly. It sands to a uniform surface that accepts basecoat, clearcoat and waterborne systems without staining or lifting.

• Easy mixing and smooth spreading for consistent fills
• Tack-free, stain-free finish compatible with modern paint systems
• Cream hardener included for predictable cure times

Can I use this with automated mixing or dispensing equipment?

Yes. In addition to the 1-gallon unit, the filler is offered in 276 mL cartridges specifically packaged for use with the 3M Dynamic Mixing System. That option streamlines metering and reduces waste in busy shops.

• Available in 276 mL cartridges for dynamic mixing systems
• Cartridge format improves jobsite cleanliness and reduces overmixing
• Provides consistent mix ratio when paired with 3M dispensers

Who is this for: 3M Platinum Select Filler 31131 is intended for professional body shops, fleet maintenance facilities and industrial repair technicians who need a high-performance, lightweight body filler that saves primer, reduces sanding time and adheres to a broad range of substrates. It is formulated for industrial and occupational use—trained technicians should follow manufacturer safety and application instructions.