How long before you can sand bondo?

A Lot. There are two schools of thought on when to sand filler. If you are doing general bodywork, leveling wavy panels, fixing small dings, etc, then wait until the filler is fully cured, about 20-30 minutes.

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. If it starts tacking up, stop applying it or you’ll mess it up.

Can you sand bondo the next day?

Choose between Bondo Fiberglass Resins, Bondo Fiberglass Repair Kits or Bondo Body Fillers. 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.

How long should body filler dry?

(If you need to use shaping tools, this is the time to do it- while the putty is beginning to harden but isn’t yet dry.) Let dry completely (20-30 minutes).

How long can Bondo be left unpainted?

Between life and work, the longest time period the bondo would go Unpainted would be about 2-3 weeks.

How long does it take for Bondo fiberglass to cure?

2 hours
Quality and Durable Repairs on Many Materials

For repairs involving large holes, breaks or damaged surfaces, it works easily with layers of Bondo® Fiberglass Cloth, Mat or Cloth Tape. The two-part resin cures in 2 hours.

Do you have to prime over Bondo?

Do You Need To Prime Bondo Before Painting? To help your top coats adhere to the metal, you should use a “direct to metal” primer (DTM), but it is not usually necessary under body filler. Once the metal is primed, you can apply a “filler primer” (2K) to hide scratches and minor surface scratches.

What is the ratio of Bondo to hardener?

50:1
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.

Is Bondo hard to sand?

Once the Bondo cures, it’s time to sand. … The lightweight Bondo Gold is far easier to sand than the heavier type, so consider using the good stuff on the way out. Use a tack cloth to remove any dust between coats.

Why is my Bondo breaking?

Do auto body shops still use Bondo?

Yes auto body shops still use Bondo and other fillers. It is a great product and if used properly, thin applications, it works great. Most Bondo problems are due to excessive thickness and improper application.

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.

What’s the difference between body filler and Bondo?

How do you sand Bondo smoothly?

How long can body filler last?

“Some dermal fillers can last for 6 to 12 months, while other dermal fillers can last 2 to 5 years,” says Dr. Sapna Palep of Spring Street Dermatology. The most commonly used dermal fillers contain hyaluronic acid, a natural compound that aids in the production of collagen and elastin.

Is Bondo stronger than fiberglass?

Registered. “Bondo Glass” is a short strand fiberglass filler, I goes on like Bondo, but it is made of fiberglass, so it is stronger, it’s also a little harder to sand then regualar bondo.

Which body filler is best?

The Best Car Body Fillers
  • 3M Bondo 261 Lightweight Car Body Filler. This lightweight product is a two-part body filler. …
  • Permatex 25909 Liquid Metal Filler. Unlike the Bondo filler, the Permatex product is ready to use, it does not need any mixing. …
  • Evercoat 156 Lightweight Car Body Filler.

What can I use instead of Bondo?

You can use plastic/metal 2-part epoxies. Repair epoxy is also a good alternative.

How hard is Bondo?

Accordingly, Bondo is a very stiff product when cured, which makes it well designed for auto bodies. … Just like caulk is too flexible to effectively fill large gaps in wood, Bondo is too stiff to do the same. When Bondo (or any auto body filler) is used to patch wood, it fails in a very short time.

Can you use Bondo glass on metal?

This waterproof filler is ideal for repairing dime size or smaller (up to 1/2″) rusted-out metal holes and shattered fiberglass body parts. It is compatible with all paint systems for cars and boats.

Can you use fiberglass instead of Bondo?

The expense of replacing damaged fiberglass panels can be significantly reduced by instead repairing the panels with Bondo. Fiberglass Bondo is waterproof, extremely strong and can be used for virtually any fiberglass panel. … Follow the steps below to use Bondo for fiberglass.

What is stronger Bondo or epoxy?

The epoxy product that I have used (Abatron) is worth the extra if for no other reason that it sands more like the wood, whereas Bondo is much harder than the wood and will tend to stand proud of the surrounding areas if you’re not careful when sanding.