Best Body Repair Putty AI pick
Chosen by an AI model from its trained knowledge, with its reasoning.
AI pick (line): Evercoat Rage Gold
It is a premium lightweight polyester filler that spreads smoothly, sands easily and has fewer pinholes than budget fillers.
Not for: Rust-through holes or large gaps that need fiberglass-reinforced filler, or final pinhole touch-ups where a glazing putty is better.
AI picks by need
For budget DIY dent filling
Bondo Lightweight Body Filler (line)
It is easy to find and forgiving, and it is fine for small dents on a first project.
Not for: Anyone who wants the smoothest, lowest-pinhole finish with less glazing work.
For pinholes and fine scratches over filler
Bondo Glazing & Spot Putty (line)
This one-part tube putty is handy for filling small pinholes and sand scratches before primer.
Not for: Filling dents or any layer thicker than a skim coat, since it shrinks as it dries.
For rust holes and fiberglass repair
Bondo Bondo-Glass (line)
Its fiberglass reinforcement bridges small holes and adds strength where plain filler would crack.
Not for: Final skim coats, since it sands coarse and needs a finer filler on top.
What the AI looks for in Body Repair Putty
- Filler type for the layer
- Use reinforced filler for holes and strength, lightweight filler for shaping dents, and glazing putty only for pinholes and scratches. Each layer does a different job. Using one product for everything gives either cracks or a poor finish.
- Thickness
- Keep body filler thin, around 1/8 inch or less after sanding, and fix deeper dents by working the metal first. Thick filler cracks, shrinks and can come loose with flex and heat.
- Hardener ratio
- Use about 2 percent cream hardener by volume (roughly a strip across a golf-ball-size mound), or follow the label. Too much hardener causes pinholes and bleed-through. Too little leaves soft filler that gums up sandpaper.
- Surface prep
- Apply over clean bare metal scuffed with coarse grit around 80, or over an epoxy primer the filler maker approves, never over etch primer or loose paint. Polyester filler loses adhesion over acid etch primer and over paint that is not sound.
- One-part vs two-part glaze
- Prefer two-part polyester glazing putty over one-part lacquer spot putty for anything more than tiny pinholes. One-part putty shrinks as solvent evaporates, so imperfections can show up weeks after painting.
Brands that matter
- Evercoat: Pro-grade fillers and glazes, including the Rage line.
- Bondo: Widely available DIY fillers, reinforced fillers and spot putty.
- U-POL: Body shop brand with fillers and glazes for professional use.
- 3M: Fillers and glazing putties within its collision repair range.
What to avoid
- Mixing filler on cardboard, which absorbs resin and can contaminate the mix.
- Stirring the hardener in vigorously, which traps air and causes pinholes.
- Spreading filler over rust you have not removed.
- Using one-part spot putty to fill dents.
Questions
Is body filler the same as glazing putty?
No. Body filler builds and shapes the repair. Glazing putty is a thin final coat for pinholes and sanding scratches before primer.