Tag Archives: paint

Tennis Court Accessories, Tennis Court Crack Filler, Tennis Court Repair

Why Do Tennis Courts Crack Under The Tennis Net?

Question: Why do tennis courts crack under the tennis net?

Answer: Tennis courts often develop cracks under the tennis net for a few related reasons:

  • Tension on the cable that supports the tennis net
  • Concrete footers that hold the tennis net posts in place

Tennis court net posts are secured by a concrete footer, when installing an asphalt tennis court.  The footer can be in place prior to the asphalt paving process or it can be installed after the tennis court has been paved.  There is a plastic or galvanized sleeve set within the net post footer, which makes the net post removable and easily replaceable.

Tennis nets are suspended by a cable, which is secured to the dead-end post, and wound or tightened with a wind assembly from the other post.  The average recommended tension on the net cable is 400 to 450 lbs.  The sustained tension from the  cable tends to pull the post footers in and can often create cracks into the surrounding asphalt.  Square or rectangular footers will often send cracks from the corners into the surrounding asphalt.  Round footers can also create cracks under the net, so it’s best to consult with an experienced court builder or resurfacing company to discuss the proper way of installing net post footers.

Here are some diagrams that show the right way to shape and install the court footers, to minimize inward shifting:

 

Net Post Footer Installation
Center Strap Anchor Installation

Concrete & Asphalt Surfaces

Concrete and asphalt expand and contract at a different rate.  When concrete is place next to asphalt, the gap between them will likely exhibit movement.  This can also happen with light posts, fence posts, shade structures, and other amenities.

Here are a few more pictures showing cracks under and around the tennis court net line:

Asphalt Cracks Under Tennis Net
Tennis Net Post Footer Cracks
Tennis Court Cracks Under Net
Tennis Net Post Crack
Asphalt Tennis Court Crack Under Net

Filling Cracks On Tennis Courts

Once the cracks have started, it’s all about maintenance.  SportMaster produces easy-to-apply crack fillers and sealants.  These products are not a structural fix, but more of a “band-aid” for cracks.  They will minimize the amount of water that flows through the cracks and into the base of the court.  Water can loosen the compacted base, and expand to create more damage during freeze-thaw periods.

Net Post Footer Cracks
Cracks forming at the concrete footing corners

If the cracks are larger than an inch wide, and very deep, we recommend having a professional tennis court contractor take and look and provide recommendations.  Many times they will need to fill the large cracks with concrete, asphalt, or other specialized means.  At some point, reconstruction or an overlay is the best long-term solution.

 

Acrylic Resurfacer, Tennis Court Paint, Tennis Court Repair, Tennis Court Resurfacing, Tennis Court Surfaces

Tennis Court Resurfacing Application Tips & Techniques

Tennis court resurfacing & repair is best performed by experienced sport surfacing contractors.  However, sometimes tricks of the trade are lost in translation or bad habits can form.  Most of the time it is not intentional, but a result of limited training sources.  This article will point out some important  application tips and techniques that are often overlooked.  It will also highlight some common pitfalls or things to avoid doing, for a quality tennis court repair and resurfacing result.

Keep A Clean Work Area

Most experienced tennis court contractors know the value of a clean and organized work area.  From time to time, we still see work areas that are unprotected and open to spills and splatter.  Make sure to use a tarp, old carpet remnants, or layers of masking paper when setting up your staging and mixing.  Dried paint spills, bucket rings, and other such mishaps may not be hidden by the new paint job. Plus, if you are setup outside of the court playing area on a sidewalk, you don’t need the extra work of sandblasting and trying to remove dried paint and coating residue.

Mixing Area

Application Squeegee & Tool Marks

There are a variety of procedures and options, when it comes to tennis court resurfacing and repair.  Many of the industry tools are very specific and make quite a difference in quality and ease of application.  The application squeegee should be between 50 and 60 durometer, which is the measure of softness/hardness of the rubber. The lower the number, the softer the rubber squeegee blade.  If the blade is too soft, it will bend over in the middle and create problems, as well.  An application squeegee blade that is too hard, will cause more visible application rows and “scalp” the color coatings leaving more visible marks. There are different types of resurfacing materials you can use, including an Acrylic Resurfacer, which reduces surface porosity.

Inside Playing Color
Tennis Court Application Marks

Touch-up Paint & Edging | Court Surfaces

Many times, the difference between a court resurfacing that is just OK and one that is great, relies on the details.  Conscientious tennis court contractors will go the extra mile with the following items:

  • Paint old net posts that aren’t ready to replace, but look worn
  • trim around the outside edge of the court, under & behind fences
  • Pull off excess material onto masking paper, like rosin and roofing paper, instead of shoveling up on the surface or pulling into the other color area
  • Use an anti-bleed line primer, like SportMaster Stripe-Rite, for crisp lines
  • Remove center strap anchors and net posts that slide out of the sleeve before surfacing.  Then, tape over the open hole before surfacing.  This prevents filling the holes with paint and keeps squeegee rows straight during application.
  • Touch up as needed if one color went into the other area, or there were line paint mishaps
  • If possible, try to start and finish squeegee application away from main entrances into the court.  Start on an edge or area that is not in a high visible area, in case there is a line from starting and ending the application.
  • Try not to blast windscreens with a pressure washer, as they can damage older, sun-baked fabrics and leave pressure washer patterns.
  • Scrape and sand previous repairs and coats so that they don’t show show through the final coats.
Paint Edging Tennis CourtPaint Edging Tennis Court
Tennis Court Touchup PaintTennis Court Touchup Paint
Tennis Court Line Paint DripsTennis Court Line Paint Drips
Tennis Court Windscreen CleaningTennis Court Windscreen Cleaning
Tennis Court Anchor RemovalTennis Court Anchor Removal
Tennis Court Masking PaperTennis Court Masking Paper

Workmanship | Tennis Court Application

A few more common workmanship issues to mention is squeegee handling and proper pouring of mixed coating materials.  Avoid setting a wet squeegee blade down on dry pavement, as it can leave squeegee blade marks that mirror through the final coat.  When applying the material, set your squeegee down in the puddle of wet material and then begin squeegeeing as usual.  If you set the squeegee down by accident and leave a slash mark, use the bottom of your show to rub out the mark before it dries.

Pour Marks | Tennis Court Resurfacing

Pour Marks are nearly impossible to eliminate when tennis court resurfacing.  There are ways to minimize the marking, which include:

  • After your initial windrow pour, always pour into the existing puddle/windrow and not directly onto the dry surface.
  • Pour low & gently into the windrow and don’t toss the material.
  • Avoid extremely hot temperatures when pouring and applying, if possible.  This will also minimize squeegee application marks.
  • Mist the surface a few passes ahead of the squeegee applicator. This brings the surface temperature down and decreases heat shock and marking.

Many experienced tennis court contractors will also try space their material pours so that each pour happens on the area where a line will be.  This helps to mask the potential pour mark from the eye, beneath the tennis court striping.

Silica Sand for Coatings

How Important Is Silica Sand In Tennis Court Paint and Coatings?

Using the correct size and shape of silica sand is very important to each specific coating or repair product used in tennis court resurfacing.  The right kind of sand is integral to the performance of each tennis court coating, patch material, or crack filler.  Without the proper sand type and amount, a coat cannot achieve its purpose.

Tennis Court Coating Coverage Rates

Tennis court coatings are squeegee applied.  The squeegee floats at the highest point of a coating, so if you are using a larger silica sand, the squeegee rides higher.  This will generally yield a thicker coat and use more coating, unless there are lots of asphalt voids and the sand it pushed down into them.  If a finer sand is used, as in the color coats, you will use a little less material and put a thinner coat.

Silica Sand for Acrylic Resurfacer and Acrylic Patch Binder (50-60 Mesh)

The size and shape of silica sands both have a specific purpose.  The lower the number, the larger the particle size (in the AFS scale of measurement).  Since Acrylic Resurfacer and Acrylic Patch Binder are both filling voids in asphalt and concrete, the larger mesh size is better.  Also the angular shape allows the sand to key together and form a nice, strong base film or patch.  Acrylic Resurfacer is also designed to provide a consistent, but somewhat rough surface.  This helps the color coating grab on and apply at the correct thickness for good coverage and long wear.

Silica Sand for Tennis Court Color Coatings and Line Paint (Rounded 80-100 Mesh)

The silica sand that is commonly used in color coatings is finer and mostly rounded.  The rounded shape helps the sand to roll under the squeegee, instead of dragging through like a small stone that fell into the puddle.  This helps to minimize surface streaking and provide a smoother, blemish-free surface.  The smoother finish also reduces the amount of tennis ball fuzz, which creates more housekeeping issues in indoor tennis clubs and facilities.

SportMaster tennis court coatings are manufactured with fibers, which will also minimize tools marks and streaks in the color coatings. The use of fibers is a big help, since many court owners and players are looking to slow down the play by using larger and more angular-shaped silica sands in the colored tennis court surface coatings. The fiber-containing formula of SportMaster enables them to have the surface speed they want, with less streaking than most other brands.

 

Tennis Court Surfaces

Drying Vs Curing | Tennis Court Surfaces & Paint

One of the most misunderstood topics and frequently asked questions are,  “what is the difference between drying and curing”  when it comes to tennis court paint and coatings.

Acrylic sport coatings are water-based, and latex is the binder or “glue” that adheres to the pavement or existing acrylic surface.  The binder also locks in all of the components of the coating system, like pigments, sand, and other proprietary ingredients. Water is the vehicle that thins the coating solids so that application by squeegee can be achieved.  Once the coating is applied, the water evaporates leaving the solids of the coating in a consistent film.  This evaporation is “drying“.

At this point, the film solids are dry.  They can even be walked on without a problem. However, all of the components of the coating are not entirely connected and bonded in a strong film.  In order for the coating components to properly coalesce, or “melt”  together,  it is important that the film remain mostly dry and in temperatures above 50° Fahrenheit.  This is especially important within the first 24 hours.  This is “curing“.

If the coating is not allowed to achieve this initial cure, the components like sand and pigment can wash or roll out the film can fall apart to varying degrees.  The level of damage or failure depends on how marginal the cure.

Tennis Court Curing Failure
Tennis Court Curing Failure

Many coating and paint specifications include the statement “product shall be applied when temperatures are 50° and rising”.  This means start coating in the morning when the temperatures are at least 50° and getting warmer, not late afternoon or evening when temps are dropping.

Remember, the coating must dry before it can begin to cure.  Starting application late in the day puts the film at risk of dew and cooler nighttime temperatures. A good rule of thumb is to avoid acrylic paint and coating application on days when the nighttime lows are forecasted to drop below 50°.  If the daytime highs are not very warm and it is cloudy, or the courts are heavily shaded, you also need to take that into consideration.  The shade will increase the drying time and affect the temperature of the court surface.  These factors affect drying and curing.

If you are forced to push the application on marginal days, you may want to use an infrared thermometer to check the surface temperature.  Pavement absorbs and holds cold for longer than most people think. In Spring and Fall, the sun is further away and not as intense. The pavement surface isn’t able to warm up as quickly as it does in the summer.

If you are a contractor and your customer is pushing you to apply when the temperature and weather is not within acceptable range, make sure to provide them with a copy of the coating manufacturer’s specifications and ask to reschedule application when conditions allow.