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Do It Yourself Tips


How To Videos

RUST OUT REPAIR

Got a rust spot on your car that needs some attention but can't afford to take it to a body shop? 3M experts demonstrate how to repair rust on your car. When left unrepaired, rust quickly spreads.

FIXING DENTS AND DINGS

Hate the small dents and dings on your car? You can make those repairs yourself with the new DIY dent repair kit from 3M. It has everything you need to prep, fill and sand small dents. If you're handy with a paint gun, you can have your repair looking like brand new in no time.

TYPES OF BONDO FILLER

Bondo® Fillers include solutions for all types of repairs and surfaces. This video shows an overview of the Bondo® Fillers product line and describes when to use which filler.

TECH TIP - MIXING BODY FILLER

Well-mixed Bondo® Body Filler ensures a great finish on your project. In this video, we share our best tips, like using a clean surface, mixing in small batches and folding the filler versus stirring.

APPLYING AND SANDING BODY FILLER

Using body filler doesn’t have to be intimidating. The key to a great finish on your auto body repair project is applying and sanding filler. This video offers a few techniques for a great finish, like making sure the surface is ready for filler and sanding the surface smooth.

COMMON MISTAKES IN BODY REPAIR

Bondo® Body Fillers have been around for over 50 years, and we’ve learned a thing or two about body repair. Whether you’re a beginner or an old hand, here are a few tips to make your project easier.

BONDO RESTORE BLACK

Bondo® Restore Black puts the black luster back into your tires, trim, bumpers and bed liner for up to 6 months! With an easy applicator, Bondo® Restore Black soaks right into the surface and won't leave a greasy finish.

FINISHING OPTIONS

After filling and repairing your project, the final step is paint finishing -- sandpaper and compounds complete the project. A good, clean surface is essential for a finished project you can be proud of.

Frequently Asked Questions (FAQ)

   What is the lowest temperature that body fillers can be used in?
45° - 50°F (7° - 10°C); if using below 65° F, the amount of hardener used should be slightly increased.
   What is the highest temperature that body filler can be used in?
Body filler can sustain temperatures up 180° F (82° C) of constant heat. Temperatures above 180° F (82° C) can cause the filler to soften and lose adhesion.
   What is the mixing ratio for body filler to cream hardener?
For a 3-inch diameter circle of filler (approx. 1/2-inch thick), squeeze out a 3-inch ribbon or strip of creamhardener. Or, use a golf ball size amount of filler, sqeeze out a 1 1/4-inch ribbon or strip of creamhardener. Filler should be a pinkish/salmon color when properly mixed, using red cream hardener.
   Does it matter what color the cream hardener is?
No. The color of cream hardener will not affect curing or cause staining.
   What solvent should be used for cleaning up?
Acetone or Lacquer thinner only.
   How can I remove cured filler?
By using a quality automotive paint stripper or by sanding; However, caution should be used when using paint stripper on most surfaces. Do not use paint stripper to clean hands.
   Body filler is not curing, why?
Either not enough cream hardener was used in the filler, the cream hardener is old and beyond it’s shelf life or filler is older than 1 to 1-1/2 years. The body fillermay have also been applied in extremely cold conditions. If the filler is a grayish color, the filler hasn’t been mixed.
   Why is the filler is curing too fast?
Too much hardener was used. Normal gel time is 4-6 minutes at 77° F. The proper mixing ratio for body filler & hardener is 50 to 1 by weight.
   How thick should fillers be applied?
One quarter inch per layer for automotive and home applications. Glazes and putties should be applied 1/8 of an inch per layer.
   When can body filler be painted?
Forty-five to sixty minutes after the application for both automotive paint and house paint.
   What types of paint should be applied over filler?
All types of automotive paints. House paints such as latex and oil-based paints.
   What type of primers can be used?
Most house and automotive primers. Etching primers should not be used due to their acid content.
   What causes my body filler to have pinholes?
Mixing in a circular motion, which forces air into the mix. Also, using too much cream hardener can cause gassing. Mixing should be done in a back and forth wiping or folding motion.
   Can body filler be applied to wood?
Yes, body filler is the best type of wood filler because it chemically cross-links to cure. It is cured and sandable in only 20 minutes, and paintable in 45 to 60 minutes. It is also compatible with all house paints and primers. Body filler can be drilled, tapped, routed and carved.
   Can filler be used on concrete?
Yes, it can be used to fill holes and cracks in dry concrete.
   Is body filler resistant to gasoline?
Yes, but can only be used to repair the outside surface of metal gas tanks that contain minor pinholes. Filler cannot be submerged in gas.
   Is body filler water resistant?
Yes. Water absorption tests show that filler only absorbs 0.3% of water,which is considered minimal. Therefore, body filler is not waterproof by itself but is water resistant. Note: If the application is primed and painted, the paint will render the application waterproof.
   Can I apply filler over a painted surface?
No, all applications should be sanded down to the bare surface including wood and metal, unless using a premium filler.
   Can body filler be thinned to make it pourable?
Yes, thin with 4 parts body filler to 1 part polyester resin (Fiberglass Resin, Part 404) or 25%.Use Cream Hardener to catalyze. Working time and cure time/dry time will be lengthened.
   Will body filler melt Styrofoam?
Yes, but only for the first 3-6 minutes while the filler is in an uncured state; doing very little damage.