There is no minimum thickness for Bondo, but there is absolutely a maximum. You do not want to apply body filler to anything that is thicker than about a 1/4”. That does not mean it can't be done, but the repair will not last as long.

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Similarly, how thick can you apply fiberglass filler?

Fiberglass should be used as the first filler applied to the bare metal if you have significant depth to fill (Anything thicker than 1/8 inch).

Likewise, how long should Bondo dry before sanding? I've used bondo quite a bit. Generally, in a matter if a few minutes it will start to harden and get rubbery. At that point, you can carve it up with a utility knife, a hand planer or a bondo rasp. Just make sure you leave enough to do a final sanding, usually within 10 to 15 minutes you can start sanding it.

Besides, can body filler be applied over primer?

Yes. You CAN apply over sanded 2k primer, or bare metal. Be sure to have the area sanded with at least a 150 so the filler has some TOOTH to grab to.

How long can Bondo be left unpainted?

about 2-3 weeks

Related Question Answers

Does Bondo crack over time?

There is no minimum thickness for Bondo, but there is absolutely a maximum. You do not want to apply body filler to anything that is thicker than about a 1/4”. Eventually the filler will shrink and possibly crack or even fall off.

How strong is Bondo?

Bondo is amazingly strong and is very easy to work with. The mixing ratio seemed vague so I went with 8 drops per 3-4 grams, on wax paper on top of a scale.

Can you use Bondo over fiberglass?

Fiberglass Bondo is waterproof, extremely strong and can be used for virtually any fiberglass panel. As an initial matter, it must be recognized that there is Bondo for metal and Bondo for fiberglass. Ensure that the Bondo for fiberglass is used.

Is Bondo body filler waterproof?

Choose between Bondo Fiberglass Resins, Bondo Fiberglass Repair Kits or Bondo Body Fillers. Bondo Fiberglass Resins and Repair Kits are 100 percent waterproof. Because they do not shrink, they are excellent sealers.

Can you put body filler on Baremetal?

Evercoat fillers are designed to work over bare, properly prepared substrates such as: steel, aluminum, galvanized metal, fiberglass, and SMC. Fillers and putties will normally work OK over properly sanded (80-180 grit) cured OEM paint.

How do you stop body fillers from cracking?

It is recommended that you apply several thinner layers of filler to deep dents and cracks to prevent having a porous finish. It is recommended that you wipe off excess Bondo and smooth out the Bondo as much as possible before it dries to minimize the sanding required.

Do you have to prime over Bondo?

You should use a "direct to metal" (DTM) primer to help top coats stick to the metal but it's not needed under body filler most of the time. Once the metal is primed then you can apply a "filler primer" (2K) to help hide scratches and minor surface irregularities.

Should I prime before Bondo?

Bondo should NEVER be on top of anything but 32-grit prepped bare metal, if you want it to stick and last. You can, however, use glazing putty on top of primer sanded with 80-grit. Hope this helps!

Will primer fill in scratches?

2 Answers. A lot of times primer and paint will fill in these tiny scratches and most people will not notice even if the scratches are not filled in completely. But since it is your house and the scratches bother you go ahead and try the diagonal movements.

Will high build primer fill pinholes?

Any high-quality automotive primer will cover and hide the scratches. Pinholes are not so easy to fix. Unfortunately, primer is very thick and does a horrible job of filling pinholes. You've no doubt heard the horror stories of builders spraying coat after coat of primer trying to get rid of them.

How long before you can paint over Bondo?

Bondo mixed to the color swatch will begin to cure in less than 10 minutes at room temperature.

Can you put Bondo over old Bondo?

Yes, you can layer bondo over bondo as much as necessary with no problem.

Can you apply body filler over sanded paint?

Fillers and putties will normally work OK over properly sanded (80-180 grit) cured OEM paint. However, with so many different types of aftermarket paint available (lacquer, enamel, urethane, water-based). We recommend that all paint be removed where filler is to be applied.”

What is the best auto body filler to use?

The Best Car Body Filler
  1. 3M Bondo 261 Lightweight Filler. See More Reviews.
  2. Permatex 25909 Liquid Metal Filler. See More Reviews.
  3. 3M Bondo Professional Gold Filler. See More Reviews.
  4. Evercoat 156 Light Weight Body Filler.
  5. 3M Dynatron 492 DynaLite Lightweight Body Filler.
  6. Evercoat 112 Rage Gold Premium Car Body Filler.

Can I put Bondo over rust converter?

Rust converter converts the rust to primer. You can prime and paint over it. Clean the loose rust off first before converting of course tho. I re-read yes you can bondo over it.

Why is my Bondo cracking?

lots of good advice out there, i found years ago that the main cause for bondo-mud to crack other than poor workmanship was,the left over tack coat in the low spots was not removed before the next coat was put on.

Does Bondo stick to wood?

Bondo, the same product used as auto-body epoxy filler, has been used by handymen for years to repair damaged wood. In fact, it works so well that the makers of Bondo now sell a similar epoxy product just for wood. You can repair wood with Bondo to make it look as good as new.

Does Bondo work on plastic?

Bondo is polyester based. It will adhere to acrylic (plexiglass), but it might dissolve some types of styrene plastic. If you are gluing plastic, a solvent bond is best. Buy a solvent for the type of plastic you are using.

What Bondo to use on wood?

Medium brown in color when mixed, Bondo Wood Filler is stainable and paintable, making it perfect for almost any wood surface inside or outside of the home. Because it is a 2-part wood filler, Bondo Wood Filler will not shrink and cures fast.