The 4 Best Auto Body gap fillers (2023 reviews)

auto body gap fillers
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Are you planning to buy auto body gap fillers, and are you confused about the options ? You have landed on the right page.

Our review process:

Our Top Picks:

Bondo Auto Body gap filler
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3M Auto Body gap filler
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Bondo Fiberglass resin
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U-Pol Auto Body gap filler
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Bondo Auto Body gap filler

Bondo Auto Body gap filler
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The bondo auto body gap filler is specially designed for your daily purpose and has all useful features. Glazing putty is useful for smoothing out 3D prints that have a lot of lines in them. It includes pulling dents, removal of paint and rust and efficient, effective masking of the area. It is a little thicker than toothpaste,very easy to shape and fill. This is more for auto body work such as dents and rust outs that can be sanded and painted.

This is the old lacquer based flazing putty that spreads so nice and thin and feathers out beautifully. It is great for filling in gaps on plastic. A small/thin amount goes a long way when sealing seams, and once dry is easily sanded smooth before priming, and painting your project.

Why We Like This:
  • Very easy to control and sands beautifully
  • Fast drying, easy to sand or apply
  • Easily applied, dries fast, sands well
  • Easy to use and works well to cover small cracks and dings

3M Auto Body gap filler

3M Auto Body gap filler
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Not everyone likes to purchase filler for their regular usage, but the 3m auto body gap filler would be an anomoly. This bondo type wood filler is great for projects as it has a smooth consistency and very easy to apply. It works where you need a very heavy duty, durable, sandable filler/sealer. The non-shrinking filler features a thicker formulation that makes it ideal for repairing vertical surfaces. It's very easy to use and mold into any necessary shape.

This fast curing two-part filler allows you to make high-quality, long-lasting repairs to metal, masonry, concrete, painted wood, plastic, drywall and more. It can be sanded to a very smooth finish and painted. It has excellent adhering properties as long as subsurface clean and solid.

Why We Like This:
  • Hardens quickly and predictably over and over
  • Worked great for rotten wood pillar and easy to use
  • Great for patching wood, drywall and more

Bondo Fiberglass resin

Bondo Fiberglass resin
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The bondo fiberglass resin might be a relatively new release, but it's still nothing short of impressive this year. The 3 m 00277 bondo glass reinforced filler can be primed and painted once cured. It includes pulling dents, removal of paint and rust and efficient, effective masking of the area. It works well on a boat, very strong and has good structure with the fiber glass. This stuff has a lot of strength due to the fiberglass fibers, and is easy to use.

This system helps you work easily, efficiently and successfully across the entire body repair process. The gel coat will be more of your protective cover /layer from UV rays and salt water etc. It is easy to mix and has plenty of fibers to patch up rust damage.

Why We Like This:
  • Seals the underlying glass and sands smooth for gelcoat application
  • Excellent filler for filling damaged fibreglass, where keel worn from repeated grounding on sand/gravel
  • Strong, useful for void filling and reinforcement
  • Hardens completely within 24 hours and is really strong when fully hardened

U-Pol Auto Body gap filler

U-Pol Auto Body gap filler
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We would, of course, be remiss if we didn't mention u-pol auto body gap filler for daily purpose. This is a good product for plastic bumpers and fenders on motorcycles. It is designed to work on any type of plastic bumper. It spreads great, and is fairly easy to work with for what it is. It has the texture of drywall compound, but dries really fast. The filer is easy to sand and blends in nicely. It comes with very much hardener. The filter goes on plastic like bondo goes on metal. It is a high-build primer for the rapid repair of surface defects in painted panels.

Why We Like This:
  • Great adhesion, filling, feather edging properties
  • Comes with more than enough product for several small to medium jobs
  • Easy to apply, sands down smooth
  • Great for bumpers and is fast and easy