"20-Year-Old Skate Park Surface Renovation" Sanuki City Nagao Skate Park
A weathered concrete park that has been neglected for 20 years has been revived into a skate park that is even smoother than newly built parks.
The "Nagao Skate Park" in Sanuki City, Kagawa Prefecture, was established 20 years ago. Built at a significant size of approximately 900m2, it became a well-known park for skaters in western Japan long before skateboarding became a trend. However, it has recently gained notoriety for its rough surface, with some people even referring to it as a "grater" due to the coarse concrete surface. Sanuki City allocated a budget and commissioned Tsumura Manufacturing Co., Ltd. and Willby Co., Ltd., which provide unique renovation methods. Using a large American grinding machine, the rough concrete surface was shaved down, and the sunken areas were filled with a special resin made in the USA that can be used outdoors, creating a smooth surface. Additionally, a penetrating surface hardener called "Seal Hard" and a water absorption inhibitor named "Aqua Pel Plus" were applied to enhance wear resistance and rainwater resistance. Finally, a test run on a skateboard was conducted to check for proper grip. The surface not only returned to a smooth finish but was also completed with long-lasting wear and rain resistance! A video showing the condition after the renovation has been uploaded to YouTube. With the permission of the sk8 on channel, we will introduce it in the related video below.
basic information
Seal Hard Skate Park Renovation Specifications - Surface Concrete Grinding: The uneven surface will be leveled using a large grinder made by American company STI. - Joint Leveling Grinding: The raised joint areas will be ground down using a medium grinder to level the height and eliminate the step. - Joint Filling Repair: Joints that were 10-20mm wide will be filled with American-made fast-setting repair mortar. - Surface Depressions Resin Filling Repair: Areas that remain depressed after grinding will be filled with a special American-made resin. - Surface Concrete Finish Grinding: Finish grinding will be done to create a smooth surface. - Application of Penetrating Surface Hardener Seal Hard: This will enhance wear resistance and create a surface that can withstand wear from skateboarding. - Application of Penetrating Water Absorption Inhibitor AquaPel Plus: This will suppress rainwater penetration and prevent surface deterioration due to rain. - Skateboard Test Run Confirmation: The finished surface will be tested with a skateboard to confirm that it provides the necessary grip for skateboarding. The penetrating concrete surface hardener was weak against rain and had low effectiveness outdoors. Therefore, by combining diamond grinding with the water absorption inhibitor "AquaPel Plus," we have eliminated this weakness and developed a method specifically for skate parks, which is currently under patent application.
Price information
The price varies depending on the roughness of the surface and the area of construction. Please contact us for more details.
Delivery Time
Model number/Brand name
Seal Hard Skate Park Renovation Specifications
Applications/Examples of results
Skate parks that have been resurfaced with the same "Seal Hard Skate Park Renovation Specification": - Higashi Kanazawa Sports Square Skateboard Park (Kanazawa City, Ishikawa Prefecture) - NiX Street Sports Park (Toyama City, Toyama Prefecture) - Sasebo Park Skateboard Park (Sasebo City, Nagasaki Prefecture) - Sumida Skateboard Park (Sumida Ward, Tokyo) Although not renovations, skate parks that have been finished with the "Seal Hard Skate Park New Construction Specification": - Green Park Daemon Skateboard Square (Imizu City, Toyama Prefecture) - Tiger Luck Skateboard Park Nagai (Osaka City, Osaka Prefecture) - Toyo Carbon Urban Sports Park Marugame (Marugame City, Kagawa Prefecture) - Nitto Shinko Stadium Maruoka Skateboard Square (Sakai City, Fukui Prefecture) - Ishioka Skateboard Park (Ishioka City, Ibaraki Prefecture)
Detailed information
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Grinding the surface damaged by rainwater with a large grinder made by American STI Corporation.
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Grind the step of the target area with a medium-sized grinding machine to level the height and eliminate the step.
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The unevenness of the bank section is ground with a special handheld grinding machine.
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The shallow recessed areas that remain after grinding are filled with a special outdoor-compatible resin made in the USA, applied with a trowel.
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The diamond blade is mounted on a large polishing machine, the same as the grinding process, to smooth the surface through polishing.
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We will apply the penetrating concrete surface hardener "Seal Hard." With the effect of Seal Hard, the deteriorated concrete will gradually harden and transform. Since Seal Hard is a non-film-forming penetrating type, it will not peel off. However, the penetrating hardener is vulnerable to rainwater, and when exposed to rainwater, the penetrating components will dissolve and wash away.
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We will apply the water-repellent agent "AquaPel Plus."
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Aqua Pearl Plus is a silane-siloxane-based hybrid water-repellent material that repels water like beads immediately after application. It compensates for the weaknesses of seal hard, which is vulnerable to rain, and transforms concrete into a strong and rain-resistant material.
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If too much Aqua Pearl Plus is applied, the grip will weaken and cause sliding during turns. Therefore, staff skilled in skateboarding will actually test it on a skateboard to check the resistance while sliding and the grip during turns. If any issues are found during the inspection, adjustments will be made through re-polishing or other cleaning methods.
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CAD data（1）
| Model number | overview | File |
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| Standard Drawing for Skate Park Surface Specifications | The "Seal Hard Skate Park Specification" is a construction method provided in the following steps 1 to 4. [Patent pending] ◆1. Concrete grinding (for renovation only) ◆2. Concrete polishing ◆3. Penetrating surface hardener Seal Hard ◆4. Water absorption suppressor (water repellent) Aquapel Plus This is a pavement specification created based on past achievements. Please feel free to copy and use it when designing future skate parks. |
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