Can you put body filler over rust?

The mere application of body filler over a substrate won't stop rust, Miller said. Fillers might contain corrosion resistance and slow the process, “but they're not gonna stop it,” he said. Put filler on rust, and “(the rust) may continue to grow,” he said.

Can you apply body filler over rust?

You don't want to put filler over rust that hasn't been stabilized because it can cause the filler to release from the surface.

Can you put Bondo over rust?

Minor surface rust can often be sanded and painted, but major rust pitting and holes may require a little more effort and material — specifically, Bondo or some other quality body filler. However, Bondo shouldn't be used on every kind of rust hole.

Can plastic fillers be applied over rust?

Body filler is not good for rust repairs. You cannot slather some Bondo over rust and expect it to stop the rust or stick to it for that matter. For rust repairs, you must first remove any rust scale from the metal.

Can you Bondo over rusty metal primer?

NO, never. bondo goes over bare steel only. Never over any kind of paint, primer, etc.

Should you prime before body filler?

46 Epoxy primer must dry for one hour and all metal work must be completed before starting the body filler process. Applying body filler over epoxy primer provides maximum corrosion protection for the metal. Apply filler within seven days of applying epoxy primer to maximize adhesion.

Does body filler go on bare metal or primer?

The short answer is filler companies suggest it needs to go on bare metal, and epoxy companies suggest you put filler over epoxy so they can sell more of their product.

What kind of body filler should I use?

Standard grade is a great option for minimal hail damage and small rust spots, while premium grade should be used for actual tears or a large surface area. Standard grade body fillers are a lightweight substance or putty that spreads easily and cures in about 20-25 minutes.

How do you use Bondo body filler on metal?

Load up your spreader with some Bondo mixture and scrape an ¹⁄₈ inch (0.32 cm) layer over the damaged area. Press down with the spreader to push the filler into the metal. Keep applying thin coats until all the dings are filled, up to a total thickness of ¹⁄₄ inch (0.64 cm).

What is the best body filler?

We have listed the top three rated car body fillers below;

• 3M Bondo 261 Lightweight Car Body Filler.
• Permatex 25909 Liquid Metal Filler.
• Evercoat 156 Lightweight Car Body Filler.

How do you repair rust on metal?

However, badly rusted metal areas need more prep work and possibly a special primer. Start with a wire brush (Photo 1). Scrub partially rusted metal areas with a wire brush to remove flakes and powdery surface rust, then prime with a rust-inhibitive primer. Once done, you can paint over rust.

How do you fill a rust hole in metal?

9 Steps to Follow When Fixing Holes Using Fiberglass and Metal Mesh

1. Remove the Rust Around the Hole by Sanding It. ...
2. Cut Around the Damaged Spot Slightly. ...
3. Fill the Hole Using Metal Sheets. ...
4. Add Bondo Glass Stratum. ...
5. Sand the Spot. ...
6. Utilize the Bondo Body Filler That's Within the Accepted Range. ...
7. Use Automobile Primer. ...
8. Paint the Spot.

How do you fix rust spots?

Sand Away the Rust: Use sandpaper or a small grinding disc to sand out the rust spot, including the paint directly around the rust area. Keep going until all the rust has been completely sanded out and you see the shiny metal base.

How do you treat rust before Bondo?

Using rust inhibiting primers that are zinc or phosphor rich will be the best bet for reducing rust recurrence. Bondo, or whatever else you use, should never be more than 1/8" thick. So at that thickness, it doesn't matter if you put it over primer or bare metal.

What is the best rust neutralizer?

1. Editor's Choice: Evapo-Rust Original. ...
2. Rust-Oleum Automotive Rust Reformer. ...
3. JENOLITE Rust Converter. ...
4. Loctite Extend Rust Neutralizer. ...
5. Rust Converter ULTRA - Pro Grade Rust Repair. ...
6. Corroseal Water-Based Rust Converter. ...
7. VHT Rust Convertor Can. ...
8. Rust Kutter- Rust Converter.

What is the best rust inhibitor?

1. Editor's Pick: Rust Converter Ultra. Rust Converter Ultra is a highly rated, affordable, and easy-to-use solution to existing automotive rust problems. ...
2. CRC White Lithium Grease Spray. ...
3. WD-40 Specialist Long Term Corrosion Inhibitor. ...
4. Dupli-Color Exact-Match Scratch Fix. ...
5. Fluid Film Protectant and Lubricant.

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.

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.

Are body fillers strong?

We often get asked about metal body fillers or reinforced fillers and what they are. These fillers are incredibly strong but do have their place in the body shop.

Can I use body filler on bare metal?

For small repairs, you can bog directly over the bare metal. If the repair is larger, or you're looking for a longer-lasting job, apply a base coat of epoxy primer before laying on the filler.

Is there a filler for metal?

Permatex Liquid Metal Filler is an easy-to-use filler that can be drilled, filed, sanded and painted. It forms a long-lasting, metal-tough bond and works on metal, wood, and concrete.

What is the difference between body filler and putty?

“The difference between putty and filler is basically the “talc” in the product. Most of our Rage line of fillers have Eco-Resin technology. With that, we use similar ingredients to putty. Therefore, when using it, the putty is no longer necessary in the repair process.”

Can you put body filler over paint?

It is normal for filler and puttie to work OK over OEM paint that has been properly sanded (80-180 grit). The aftermarket paint market is filled with a variety of different types (lacquer, enamel, urethane, water-based). Paint should be removed from the area where filler will be applied before it is applied.

Can you Bondo over por 15?

CAN I USE BODY FILLER OR PUTTY WITH POR-15? Yes. First paint both sides of the rusted area with POR-15; then use body filler or putty as soon as the POR-15 is dry to the touch.

How long does body filler take to 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).