Elena Rossi
Bondo Glazing and Spot Putty is a two-part mix product used for filling in cracks, holes, and surface irregularities. It is commonly used in automotive and model rocketry applications. The product is applied by forcing it into cracks or holes and then smoothing it with a putty knife or plastic spreader. It dries quickly and can be easily sanded down to create a smooth finish. Before painting, it is recommended to prime the surface to prevent pinholes and imperfections in the final paint finish. While Bondo Glazing and Spot Putty can be painted over, there are some considerations to keep in mind, such as ensuring the putty is fully cured before painting and using appropriate primers or sealers for the best results.
| Characteristics | Values |
|---|---|
| Ease of use | Water-based, easy to work with, stays put, doesn't shrink, fills gaps, no runs, no sags, no drips, can be smoothed with a bare damp finger to a perfect finish (no sanding required), provides additional structural strength, no bubbles or voids to refill |
| Sanding | Shrinks very little and sands super easily, dries quickly, and sands to a powder, takes longer to dry and is a bit tougher to sand, sanding scratches must be sanded out with finer grits, sanding sponges are a good idea |
| Paint | Primer/paint goes over it just fine, latex paint won't stick to it (peels off as a plastic film even with blue tape left over for two days), unless oil (at least shaker can, like ZPrime, CoverStain) primer is used and sanded before latex, has been used with GF Milk Paints without any problems |
| Other | Dries clear, smells like rockets, can be used to fill in surface irregularities, fills huge dents in a door instead of a small line in a fender, fills pinholes |
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What You'll Learn
Bondo glazing and spot putty can be painted over
Before painting over Bondo Glazing and Spot Putty, it is recommended to prime the surface first. Some users have reported success with using a Coverstain spray can or primer as a base before applying paint. It is also important to ensure that the paint or primer is fully cured before applying Bondo, as it can soften coatings if they are not completely dry.
When using Bondo Glazing and Spot Putty, it is important to follow the instructions carefully. Bondo is a two-part solution that requires mixing the red activator into the grey base. It is important to only mix as much as needed, as the chemical reaction begins instantly and any unused mixture will become useless.
Bondo Glazing and Spot Putty is known for its ease of use and fast drying time. It can be used to fill in surface irregularities and is particularly effective for filling spirals in model rocketry. However, it may require more than one application for deeper fills.
Overall, while Bondo Glazing and Spot Putty can be painted over, it is important to consider the type of paint or primer being used and to follow the proper preparation and application techniques for the best results.
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It's best to prime before painting
Bondo Glazing and Spot Putty is a lacquer-based product that dries quickly and sands easily. It is often used to fill in surface irregularities and is known to be water-based and easy to work with.
While some people have used Bondo Spot Putty over paint, it is generally recommended to prime before painting. Priming has several benefits and can help solve specific problems, leading to cost and time savings. Here are some reasons why it's best to prime before painting:
Seals Pores and Covers Imperfections
Primer fills in the pores of unpainted surfaces such as drywall and wood, creating a smooth base for the topcoat of paint. It also helps cover imperfections, such as patched or repaired areas, by bringing the surface back to a neutral colour, usually white. This creates a blank slate for the new paint colour, ensuring that the old colour does not bleed into the new one.
Provides a Surface for Paint to Adhere To
Primer provides a surface for the paint to stick to, which is especially important when painting over glossy or oil-based surfaces. Without primer, the paint may not adhere properly and could peel off.
Blocks Stains and Odours
Priming helps block out stains, such as greasy spots or crayon marks, ensuring they do not bleed through the new paint. It also helps eliminate strong odours, such as cigarette smoke, that may be absorbed into the walls.
Reduces Material Absorption
When painting on absorbent surfaces, the paint can be absorbed into the material, requiring multiple coats for adequate coverage. Primer reduces this absorption by filling in the pores of the material, allowing the top coat of paint to cover nicely in just one or two coats.
While Bondo Glazing and Spot Putty can be used for filling and smoothing surfaces, priming before painting is generally recommended to ensure the best results and to address specific challenges that may arise during the painting process.
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Bondo dries quickly
Bondo dries fairly quickly, usually within an hour or so, depending on the ambient temperature. It is not air-drying and requires a hardener to cure. The amount of hardener added will determine how quickly the Bondo dries—the more hardener added, the faster the cure time.
The curing process can be sped up by using a blow dryer, sunshine, or a heat gun. However, using a heat gun can be risky as it may get too hot and overbake the Bondo, causing it to shrink and peel off. A blow dryer is recommended as it is less likely to get too hot.
Bondo can also be placed in an oven to speed up the hardening process. Conversely, cold temperatures will slow down the curing process.
Once the Bondo has kicked and is solid, it can be shaped and sanded. It is important to ensure that the hardener is thoroughly mixed in to avoid streaks of unmixed material, which will remain sticky.
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It can be used to fill in cracks and holes
Bondo Glazing and Spot Putty is a versatile product that can be used to fill in cracks and holes on a variety of surfaces. It is suitable for use on metal, wood, concrete, fiberglass, and other materials. The product is designed for small surface repairs, such as filling in minor scratches, dings, and imperfections up to 1/4 inch deep.
When using Bondo Glazing and Spot Putty to fill in cracks and holes, it is important to follow the proper technique. First, force the putty into the crack or hole, overfilling slightly above the surface. Smooth it out with a putty knife or plastic spreader. Allow the putty to dry for 10-20 minutes until it is completely hardened. The drying time may vary depending on temperature and humidity.
Once the putty is dry, you can begin the sanding process. Use 180-220 grit sandpaper to sand the putty smooth, being careful not to sand through the surrounding areas. It is recommended to prime the putty before painting to prevent pinholes or imperfections in the final paint finish. You can then proceed with painting to match the surrounding areas.
Bondo Glazing and Spot Putty is known for its ease of application and fast drying time. It is a popular choice for filling in small nicks, cracks, and holes, providing a smooth and professional finish. However, it is important to note that insufficient drying time before sanding or adding additional coats can lead to issues such as gouging, uneven sanding, and peeling. Therefore, it is crucial to allow adequate drying time and follow the instructions carefully for optimal results.
In addition to filling cracks and holes, Bondo Glazing and Spot Putty can also be used for a variety of other applications. It is commonly used for cosmetic repairs on vehicle bodies, touching up chips and flaws in walls, furniture, and appliances, and smoothing imperfections on marine equipment. With its versatility and effectiveness, Bondo Glazing and Spot Putty is a valuable tool for repairing and restoring various surfaces.
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It can be used on cars
Bondo Glazing Putty is ideal for minor cosmetic repairs on cars, trucks, and motorcycles. It can be used to fill small holes, cracks, and imperfections. When using Bondo Glazing Putty on cars, it is important to follow the correct process to ensure a smooth and professional finish.
First, the putty should be applied to fill any dents, scratches, or flaws. Once it is dry, the putty can be sanded smooth using fine-grit sandpaper. It is important to be careful during this step to avoid sanding through the surrounding good areas or bare metal. If any low spots appear after initial sanding, the area should be cleaned, and the putty application process should be repeated.
Before painting, it is essential to prime the surface. Primer fills tiny voids in the putty, creating a glass-smooth surface and preventing pinholes or imperfections in the final paint finish. On cars, a 2-part auto body primer is recommended for the best results. A spray application can help identify any imperfections before painting.
After priming, the Bondo Glazing Putty can be painted to match the surrounding areas. It is important to allow the putty to fully cure before painting and to avoid applying paint over soft or wet putty. Bondo's 1-part nitrocellulose formula is designed to be non-staining, ensuring that it won't affect the colour of paint or finishes around the repair area.
Bondo Glazing Putty is commonly used for small repairs on vehicle body panels, filling pinholes in body fillers, and covering minor sand scratches. It can be applied directly from its dispensing tube, making it easy to use for auto body repairs.
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Frequently asked questions
Yes, Bondo Glazing Putty is designed to be painted over for a colour-matched repair. It is recommended to use a primer before painting to prevent pinholes or imperfections in the final paint finish.
Force the putty into any cracks or holes and overfill slightly above the surface. Smooth with a putty knife or plastic spreader and let dry for 10-20 minutes until completely hardened. Sand the putty smooth using 180-220 grit sandpaper.
Common mistakes to avoid include not properly sanding and preparing the surface before application, applying too thick of a coat, not priming before painting, and painting before the putty is fully cured.
