What is Bondo glass used for

Bondo-Glass is a unique reinforced filler containing short, interlocking fiberglass strands and fibers that make it twice as strong as regular body filler. Repairs small (dime size or smaller) rusted-out metal holes and shattered fiberglass body parts. PERFECT FOR MARINE USE!

What is the difference between Bondo and Bondo glass?

“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.

Can Bondo glass be used on plastic?

the answer is no.

Does Bondo glass stick paint?

Bondo Ultimate can be applied directly over sanded and cured primer and paint. This filler remains easy to sand for days after the application.

Is Bondo glass filler waterproof?

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.

How thick can you apply Bondo glass?

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!

What can I use instead of Bondo?

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

Can Bondo glass be sanded?

Cut and sand Once the Bondo cures, it’s time to sand. Power sanders are OK to break the surface and knock down any high spots, but hand sanding with the body contour is the best way forward.

Can you Bondo over factory paint?

Fillers and putties will normally work OK over properly sanded (80-180 grit) cured OEM paint. … We recommend that all paint be removed where filler is to be applied.”

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.

Article first time published on

Will Bondo stick to vinyl?

Bondo will stick to vinyl wraps and sticker decals. … The surface that was fixed with Bondo has to be sanded. It will work if it is a flat surface.

Can I use body filler on a plastic bumper?

It is not recommended for body filler to be applied over plastic bumper covers. Most bumper covers are made from a thermo plastic TPO or PP. This type of plastic has a problem with things adhering well. Body filler is designed for steel, galvanized steel, zinc coated steel, SMC, fiberglass, and aluminum.

Does Bondo all purpose putty work on plastic?

This fast curing 2-part filler allows you to make high-quality, long-lasting repairs to metal, masonry, concrete, painted wood, plastic, drywall and more. Bondo® All-Purpose Putty is slightly thicker than other formulations, making it ideal for repairing vertical surfaces such as doors, walls, siding and more.

How long does it take for Bondo to set up?

Bondo mixed to the color swatch will begin to cure in less than 10 minutes at room temperature. Too much hardener in a warm environment will reduce working time, but too little in a cool environment can result in maddeningly long curing times.

What's the best Bondo to use?

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

What are the different stages of Bondo?

• Stage 1 — Prepare. This stage includes pulling dents, removal of paint and rust and efficient, effective masking of the area.
• Stage 2 — Fill. …
• Stage 3 — Paint. …
• Stage 4 — Finish.

Why is Bondo bad?

Unfortunately, filling compounds such as Bondo also present some drawbacks. Fillers like Bondo can crack if they are mixed too thickly, harming rather than improving the look of the car. Additionally, there’s a risk of discoloration and poor long-term wear when you use a dent repair filler like Bondo.

What is stronger epoxy or Bondo?

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.

What grit sandpaper do I use for bondo?

Use 60 to 80 grit paper to sand down below rust, deeper scars or to sand down and begin to shape body filler, such as bondo. These are very coarse grits and should only be used in specific areas where you really need it since it will leave sanding marks.

How do you know if a car has bondo?

Easy way to tell is to place a magnet on various body panels. Place it especially on the quarter panels, rocker panels, any area where rust can develop. If it won’t stick, that’s where the Bondo or filler has been used.

Why does my bondo bubble?

Contamination on the surface. Overmixing of the filler, getting entrapped air bubbles. On a second (or higher coat), sanding the suface, having powder remaining on the surface, and layering another coat over it.

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.

What is glazing putty?

Glazing Putty is commonly used in the installation and repair of window glass panes. Glazing putties are made from many different materials. The putty immediately forms a tight seal that keeps-away moisture and has immense bonding strength.

Can you put Bondo over por15?

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.

Do you remove paint before using body filler?

Before adding any filler, you should get the metal fairly close. … Also, before stripping any paint, run a metal body file or sanding board over the area to show high and low spots.

Does Bondo stick to brass?

“Brass and Bondo don’t mix,” they used to say, but in ‘the day’ we used ’em together all the time.

Can you spray paint over Bondo?

A direct application of Bondo Ultimate over sanded or cured primer and paint is possible. After applying this filler, it is easy to sand.

Can I put body filler over primer?

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.

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.

What happens if you put too much hardener in Bondo?

If you add too much hardener, the mixture will gel too quickly. If you add too little, it increases the amount of time for it to cure, and if you don’t add enough it will never cure. If you add 1 line of hardener across the top of the dollop of Bondo, it takes about 15 minutes to dry after applying.

Do you have to add hardener to Bondo?

How Much Hardener Do You Add To Your Body Filler? You need to be sure to add the right amount of hardener to your Bondo; adding more than enough will cause your body filler to dry faster and give you less time for shaping and laying your filler on your panels.