What are tips for repairing a car with Bondo?

1. Is Bondo good for car repair?
2. Does Bondo harden without hardener?
3. What grit sandpaper do I use for Bondo?
4. How big of a dent can you fill with Bondo?
5. Does Bondo need to be primed?
6. How long should Bondo dry before sanding?
7. Can you put Bondo over paint?
8. What is the ratio of Bondo to hardener?
9. What is the difference between body filler and putty?
10. Is Bondo body filler waterproof?

Is Bondo good for car repair?

Unfortunately, a dent repair filler like Bondo is not ultimately the best choice you have to fix car dents. Fillers like Bondo can potentially harm your car in the long run.

Does Bondo harden without hardener?

Without it the bondo won't get hard. Put a small piece of bondo on a board and run a line of hardener from end to end. It will take about five minutes to mix it up and apply it.

What grit sandpaper do I use for Bondo?

First step: Prep the Surface

Make sure to sand outside of the repair area as Bondo will need to be spread and applied wider than the damaged area. (36-grit to 220-grit should do the trick for body filler application). AutoBodyNow.com sells a vast assortment of sandpapers and sanders to complete this step.

How big of a dent can you fill with Bondo?

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. Eventually the filler will shrink and possibly crack, or even pop off!

Does Bondo need to be primed?

Registered. Yes priming it would be best.

How long should Bondo dry before sanding?

Allow the putty to dry 15 minutes at 77 degrees F (25 degrees C). In cooler climates, putty may take 20-30 minutes to dry. 7. Using 3M™ Sandpaper 80 grit, sand and shape the filled area to the contour of the surface.

Can you put Bondo over 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 ratio of Bondo to hardener?

Place the proper amount of Bondo filler and hardener: 50:1. First, place the filler on the mixing board and then place the hardener. 3. Mix with a plastic or metal Filler Spreader.

What is the difference between body filler and putty?

Putty is essentially a thick paint with a filler material - it's generally used for very small scratches where the metal is not exposed. Air hardening. Body filler is a polyester resin suitable for small dents. Chemical hardening, a cheap and easier (by a long way) substitute for body solder.

Is Bondo body filler waterproof?

Bondo Fiberglass Resins and Repair Kits are 100 percent waterproof. ... Bondo Ultimate can be applied directly over sanded and cured primer and paint. This filler remains easy to sand for days after the application.