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Bondo® Body Fillers cure fast, and are formulated to be a non-shrinking and permanently durable material for repairing concrete & masonry. Bondo® Fiberglass Resins are also often used to seal concrete.
Why use Bondo® Body Fillers for repair of Concrete & Masonry?  click here
- Bondo® products cure hard, making them appropriate for high traffic areas.
- All Bondo® Body Fillers and Fiberglass Resins can be primed and painted.
- Finish the repair the same day you start. Sand, prime and paint soon after application.
Body Fillers
Bondo® Body Fillers are excellent fillers because they chemically cross-link to cure. They are cured and sandable in only 20 minutes, and paintable in 45-60 minutes. They are also compatible with all types of house paints and primers. Body fillers can be drilled, tapped, routed and carved. Bondo® Body Fillers are extremely weather/water resistant, and resist weakening or cracking where extreme temperature changes are evident.
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Instructions
- Clean repair area with warm soapy water; let dry completely
- Remove paint, primer, and other loose surface debris.
Use 80 grit sandpaper to ensure good adhesion
- Mixing:
Knead cream hardener tube thoroughly before using.
For golf ball size amount of filler, squeeze out 1-1/4 inch strip of hardener.
Or, for repair area 3 inches in diameter, 1/2 inch thick, use three inch strip of cream hardener.
Mix thoroughly to uniform colour on clean non-porous surface.
Mix only small amounts that can be used within 3-4 minutes.
Proper mixing ratio: 50:1 by weight.
Do not add cream hardener in filler container.
- Spread initial layer of mixed filler over repair area, using firm pressure to ensure maximum adhesion.
- Allow the application of filler to cure 20-30 minutes. Sand with 80 grit sandpaper.
If needed, additional layers can be applied once sanded.
Featheredge with 180 grit sandpaper to blend the edges.
- Paint, or prime and paint as required.
Optional:
Apply a very thin layer of Bondo® Glazing and Spot Putty to fill pinholes or small imperfections.
Sand with 320 grit sandpaper. Paint, or prime and paint as required.
Tips
- For best results, apply at 7 degrees Celsius or above.
- Bondo® Professional Gold and Bondo® Ultimate achieve finest results. These professional grade fillers are easier to mix, smooth and apply, and provide extremely easy and clog-free sanding.
- Using Bondo® UV Body Filler eliminates the need for mixing filler with hardener.
Its "no rush" applications gives the user all the time needed to apply.
Cures in 10 minutes in direct sunlight and is easy to sand.
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Fiberglass Resins
Bondo® Fiberglass Resins & Repair Kits are 100% Waterproof. Because they do not shrink, they are excellent sealers. Bondo® Fiberglass Resin is sandable in less than 2 hours, is compatible with all paints, and creates a strong and long lasting bond.
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Instructions
What you will need:
Paint brush, rubber gloves, measuring cup or tablespoon, mixing stick, sanding block
and sandpaper (80 & 180 grit), scissors, acetone or laquer thinner and fiberglass cloth or
mat.
- Clean repair area with acetone or warm, soapy water; let dry completely.
Sand with 80 grit sandpaper to remove all primer, paint or other debris.
- Put on gloves. Pre-cut fiberglass cloth or mat to extend 2-3 inches beyond repair area.
- Mix the liquid hardener:
Estimate the amount or resin needed to completely saturate the fiberglass cloth or mat. Pour resin into
clean container or measuring cup. For every 30mL of resin, use 12 drops of hardener. Or, for 6 tablespoons
of resin, use 1/4 teaspoon of hardener.
Mix thoroughly.
- Brush a coat of the resin/hardener mixture onto the damaged area, extending 2-3 inches beyond.
- Place fiberglass cloth or mat onto clean non-porous surface such as sheet of aluminum foil. Use paint
brush to apply resin/hardener mixture to fiberglass cloth/mat.
A dabbing motion will help saturate the material.
Place saturated fiberglass material over damaged area, flattening and smoothing with a plastic spreader
or squeegee. Brush another coat of resin/hardener mixture over the fiberglass material.
Similarily, place subsequent pieces of fiberglass material over the damaged area, following the same
procedure. May require more than 2 pces of fiberglass depending on the size of the repair and the
desired strength. Allow material to harden 1-1/2 to 2 hours at 23.89 degrees Celcius (75F) or above.
Curing will take longer at cooler temperatures.
- Sand with 80 grit sandpaper, featheredge with 180 grit sandpaper to the edges, then paint.
- Clean up tools with acetone or laquer thinner.
Tips
- Working life of the resin/hardener mixture is approximately 12 minutes. Mix in small amounts, or only the amount
that is required for the repair.
- Resin can be used only as a sealer when being used without fiberglass cloth or mat (very thin application)
- Do not put mixed/unused material back into the container as it will harden the entire contents.
- Bondo® Bondo-Glass Filler contains short interlocking fiberglass strands, and eliminates the need
for fiberglass cloth. Recommended for small repairs (dime size or smaller)
- Bondo® Bondo-Hair Filler is formulated with long strands of chopped fiberglass, eliminating the need for fiberglass cloth.
Recommended for repairs up to 1" in size.
- Fiberglass Resin Jelly is a no drip jelly that is great for vertical surface repairs
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