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Can Bondo Be Used Over Fiberglass?

Asked by: Carlo Predovic
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This filler can be used over bare metal or fiberglass. In auto body, it is normally the first coat applied over welded repair.

Should I use fiberglass or body filler?

Fiberglass filler is much stronger and harder than regular body filler so anywhere the filler needs extra strength is a good place for fiberglass filler. I rarely use long strand filler because it can’t be spread as smoothly but when a large area needs the strength the long strand is usually the material needed.

How thick can you apply fiberglass filler?

Body filler should be applied in thin layers from 1/8-inch to 1/4-inch thick, with dry time between layers.

Can you paint over fiberglass filler?

Yes, the Slick Sand can be sealed with another coat of epoxy primer then immediately painted OR it can be coated with a 2K filler primer then sanded and painted. Depending on the products you’re using and the color of the car you may need to seal prior to applying color.

Will bondo stick to gelcoat?

bondo has a polyester resin base so ya… polyester fiberglass resin (or gel-coat) will bond fine.

Can you fix rust holes with fiberglass?

Fiberglass is a non-corrosive material that can be used as reinforcement or as a repair patch on almost all surfaces including metal, plastic, and wood. Typically, fiberglass is used for rust repair by replacing the rusted metal and sealing the surface.

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.

How do you fill small holes in fiberglass?

When you are trying to repair a small hole in fiberglass, the best type of product to use is a premium epoxy. This will insure a proper repair and will not allow for shrinking of the material and create a water tight seal. We recommend the Hawk Epoxy Kit. It contains the epoxy resin, catalyst and filler for the job.

Can you Bondo over primer?

A Bondo type of filler, is used for thicker applications, shaping and the like, all the rest is more like primer, the trick for all fillers is to be completely DRY before any type of paint or even primer is put over it, as then it may never dry completely and it then will draw moisture, when it is completely DRY, it …

Can you put fiberglass over metal?

Fiberglass is a very durable material that will bond to almost any surface, including plastic, metal, wood and Styrofoam. For laying up fiberglass on hard materials such as metal it’s important to thoroughly scuff the surface to get a strong bond.

How do you get fiberglass to stick to metal?

Apply the epoxy to the metal surface and the fiberglass surface. Stick the fiberglass and metal together. Wipe off any epoxy that squeezes out. Allow the epoxy 24 to 48 hours to cure, bonding the fiberglass to the metal.

Can you gelcoat over gelcoat with wax?

The most common type of surfacing agent is Wax Additive Sanding Aid. This wax additive seals off the surface from oxygen in the air, allowing the gelcoat to dry tack-free. The recommended ratio is 1 oz wax to 1 quart of gelcoat. The first coat of gelcoat does not need the wax since you will apply a second coat.

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Can you gelcoat over epoxy filler?

Typically, gelcoat isn’t recommended over epoxy because they’re chemically incompatible and the gelcoat won’t adhere properly.

Can you gelcoat over fairing compound?

Can you apply gelcoat over the fairing compound? Gelcoat should not be applied directly over epoxy fairing compounds like TotalFair. Doing so will result in the gelcoat failing to cure properly.

Does fiberglass need to be primed before painting?

Do you need to prime it? You do not usually need to prime fiberglass before you paint it because it is already smooth. Some fiberglass is rough and you will need to sand it down and prime it before you paint it. Apply 1-2 coats of primer if you have rough or weathered fiberglass before you paint it.

What kind of paint do you use on fiberglass?

Acrylic Latex

Acrylic paint adheres well to fiberglass, overcoming one of the main challenges to painting this material. Acrylic paint is less likely to crack and blister, and will hold up well to cleaning. This water-based paint is easy to apply, and contains fewer chemicals, so is more environmentally friendly.

What Primer Do you use on fiberglass?

Rust-Oleum Marine Wood & Fiberglass Primer provides a smooth base coat on surfaces that will be top coated with Rust-Oleum Marine Coatings Topside Paint. Recommended for wood and fiberglass that is above the waterline.

How thick can you build up 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!

Can you use P38 on Fibreglass?

ISOPON P38 polyester filler is a two component chemical paste used for the filling of holes and imperfections in surfaces such as steel and GRP. … Surface preparation and instructions for use ISOPON P38 polyester filler can be used on the following surfaces:- Bare steel – degrease and abrade with P80 paper.

How long does Fibreglass filler take to dry?

How long does the resin take to harden? (eg 5 minutes or 30 minutes) This depends on the temperature of your working conditions and how much catalyst has been incorporated into the mix. Warmer temperatures will reduce your curing time and colder temperatures will increase the length of cure.

What material will fiberglass not stick to?

Fiberglass resins will not stick to woods that have been treated. They only stick to untreated, clean, dry wood. Redwood is not only usually treated, but it also contains a waxy substance prohibiting adhesion.

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