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USA Sale Office - Tennis Universal Inc.(USA) Chicago, IL Telephone:  800 263-8800
Head Sale Office - Tennis Universal (Canada) P.O. Box 4258 Edmonton, Alberta  Canada T6E 4T3 Telephone: 800 263-8800

Leveling Asphalt & Concrete Depressions - MultiAcrylic™ Patch Binder

What Causes Depressions in Concrete and Asphalt Sport Surfaces?
Puddles on Tennis CourtThere are generally two causes for depressions and divots on asphalt and concrete sport surfaces. Birdbaths (depressions) are mostly caused by settling of the gravel base below the surface, resulting in the surface sagging into unacceptable depressions. Additionally, divots in concrete or asphalt can be caused by the expansion of a aggregate particle located near the surface or the expansion (due to freezing) of water absorbed by an aggregate particle. In either case, the particle breaks away from the mass of the concrete or asphalt carrying with it the surface layer of mortar. Both depressions and divots can be repaired, with a bit of patience, our MultiAcrylic Patch Binder, and our step-by-step instructions.


How do you know whether to level a depression? If it bothers you, fix it.


Guidelines to know which depressions to fill and which to leave.

Let's put your court into the proper perspective. You have a sport surface court, not a pool table. The perfect ever-lasting court has never been built. You will never find an outdoor tennis our basketball court court without some depressions forming over time. What you need to determine is which depressions to fix (if any) and which ones are acceptable in accordance with published guidelines. 

The United States Tennis Court and Track Builders Association (USTC & TBA) recommends:

Puddles on Sport SurfacePrior to application of a color finish system, the court surface shall be flooded with water and allowed to drain; then if remaining water covers a 5-cent coin in any area, that area shall be patched and leveled in accordance with the recommendations of the manufacturer of the color finish. (Note: if the standing water (puddle) does not cover the coin, it is considered within tolerance and will evaporate within a reasonable period of time). Re-flooding may be necessary until "birdbaths" are minimized.


Where to Begin?

After a rainfall, or after flooding the court with a sprinkler or hose, let the court thoroughly dry (minimum 2 hours) and then decide which areas you want to level, based on the water left on the court in the depressed areas. Refer to the above recommendations if unsure.


Let's identify the puddle areas.

Chalk Line to Mark Puddles on CourtAfter you have decided which depressions you want to fix, use a piece of chalk to mark around the edge of each puddle you plan to level. Marking the perimeter edge of these puddles will allow you to see exactly the area you will be leveling once the court has dried and you begin repairs.


Note: For minor depressions you having decided to leave as they are, we recommended keeping a water roller remover by the court fence as a quick and simple way to disperse minor puddles after a rainfall.


To view Water Roller Removers, click here.


MultiAcrylic™ Patch Binder for Leveling Depressions

MultiAcrylic™ Patch Binder is an asbestos-free, 100% acrylic liquid binder designed for on-site mixing with silica sand, cement and water. MultiAcrylic™ Patch Binder is ideal for leveling and repairing low spots and depressions on tennis courts, basketball courts and other sport surfaces. When batched, MultiAcrylic™ Patch Binder will form a trowel grade consistency and should be applied at ¼” depths, applying additional lifts at ¼” deep to complete the leveling of the depressions. If applied too thick, the repairs will not cure properly, and cracking of the level repair is likely.  Coverage ratio: 5-gallons of MultiAcrylic™ Patch Binder when batched will complete approximately 25 square feet at ¼” deep. Curing time: minimum 24 hours.


Container Size: 5-gallons

Coverage Rate: approximately 25 sq. ft. 1/4" deep

Curing time: 1-3 days depending on temperature and humidity


Getting Ready to Repair Depressions

Surface Preparation

Power Washing Court SurfaceThe court surface must be cleaned entirely of dirt, dust, mildew (if any), debris and all loose materials including vegetation. Note: New asphalt and new concrete must cure for a minimum of 28 days prior commencing repairs or coating applications. Note: New concrete should also receive an application of MultiAcrylic™ Adhesion Promoter prior to commenting repairs and coating applications.  For existing surfaces, it is strongly recommended to thoroughly power wash the entire surface using a fan spray nozzle and a psi of 2000-2200 (pounds per square inch). Ensure you give special emphasis on cleaning any black mold areas within the depressions. Crack repairs within the depressions must be completed prior to leveling.


To view MultiAcrylic™ Adhesion Promoter, click here.


To view Treating Cracks, click here.


Patching Mix

MultiAcrylic™ Patch Binder


Silica Sand (#20-#40 mesh) AFS angular 

145 lb.

Portland Cement (mix with water before adding)  

22-28 lb. 


1-gallon of less (as little water as needed to mix with cement)

Important Tip:
Always mix cement thoroughly with a minimal amount of water before adding to MultiAcrylic™ Patch Binder and sand mixture.


Mixing Instructions

  1. Thoroughly mix MultiAcrylic™ Patch Binder and silica sand together, keeping a continuous stir while adding the sand.
  2. Mix cement thoroughly with a small amount of water (to make a liquid cement mix), then pour into the MultiAcrylic™ Patch Binder and sand mixture.
  3. Add only enough water to obtain trowel-grade workability.

Applying MultiAcrylic Patch Mixture to Depression

Trowel MultiAcrylic Patch Binder for Depressions Tennis and Basketball CourtsThe application of the MultiAcrylic™ Patch leveling mixture will require a large trowel and/or a straight-edge screed for larger areas (1" x 3" straight board). Ideally, the screed should be no longer than 6" greater than the widest part of the depression. If completing the leveling repairs in multiple lifts of ¼”, you will need to apply the first applications using the trowel, skimming a ¼” amount over the base of the depression. Allow to thoroughly dry before applying additional ¼” lifts. The straight-edge screed will be used for leveling final lifts (if multiples lifts are required). Be sure to have your trowel or straight-edge screed ready and available before mixing batch material.


Important Note:  Do not apply patch material greater than 1/4" deep at one time. Patches are to be done in successive lifts of ¼”, allowing curing time between each lift, usually 24 hours depending on temperature and humidity.



Application Process

MultiAcrylic Patch Binder for Leveling Depressions on Tennis And Basketball CourtsDeposit batched MultiAcrylic™ patch material (after mixed with silica sand, cement and water) in the center of the depression. If completing a first lift of ¼”, use a trowel to skim the material into the depression. If completing the final lift, use the straight-edge screed to level the material, pulling the material to the edge of the chalk-marked area, and leveling with the surrounding court surface. Tip: Feather the edges of the final lift with a paint brush from the outside into the patch to assure a smooth feathered edge. Allow to cure.


Fine Tuning Leveling Repairs

MultiCover Acrylic Resurfacer Base Coat for Tennis and Basketball CourtsDue to the addition of cement to the MultiAcrylic™ Patch mixture, shrinkage cracks may appear once dried. Ideally, MultiCover™ Acrylic Resurfacer with Sand (base coat) should be applied to the entire court surface after completing repairs when significant amounts of leveling has been done on the court. Follow the instructions provided for applying a base coat of MultiCover™ Acrylic Resurfacer.

To view Applying A Base Coat, click here.


To view MultiCover™ Acrylic Resurfacer, click here.


Not Planning on Applying a Base Coat?
If you do not plan on applying MultiCover™  Acrylic Resurfacer as a base coat to seal and conceal you repairs, you can sand the edges of your repairs once dried to reduce the repairs from show through the court paint. Additionally, priming the patched repair areas with MultiMate™ Court Paint will prevent the patch from 'flashing' through when the court is finished.  Using the color of MultiMate™ Court Paint you have chose for that area of the court, apply this primer coat with a paint brush for smaller areas or use the application squeegee for larger areas. Let this paint dry thoroughly before commencing the appications of MultiMate™ Court Paint to the entire surface.
To view MultiMate™ Court Paint, click here.
To read step-by-step instructions for applying MultiMate™ Court Paint, click here.
To view Application Squeegee, click here.


Tools for Large Depression

Ensure you have the appropriate sized straight-egde or screed to complete the leveling of large depressions. We offer screeds from 4’ to 10’ wide.


To view Screeds, click here

Clean Up:

Wash tools with water. If material has dried, use kerosene.



  • Read the container label before using. Follow label instructions. When applying, surface temperature must be a minimum of 50 degrees F. (10C) for a minimum of 24 hours. Do not apply if overnight temperatures drop to below 50 degrees F (10C).  Do not apply if surface temperature exceeds 135 degrees F. (57C)
  • Do not apply if night temperature will be dropping below 50 degrees F. Depending on the depth of the cracks and depressions repaired, you may require two or three days and nights with surface temperatures in excess of 50 degrees F. for the repairs to thoroughly cure.
  • Do not apply when rain is imminent or forecast
  • When applying indoors, use with adequate ventilation during application and drying
  • Close containers when not in use
  • Do not store in direct sunlight or where temperature may exceed 100 degrees F.
Please contact us if you have any questions about the resurfacing process described above and not answered by the above application guidelines. Your input is welcomed and greatly appreciated.
Please feel free to contact us at 1-800-263-8800 for
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