---
title: "Blok-Lok: Columbus Tustin Middle School"
description: Columbus Tustin Middle School protected its split-faced block exterior with Blok-Lok to stop water damage and extend the life of the building.
image: https://blog.rainguardpro.com/hubfs/columbus-tustin-middle-school-tustin-ca-2-schoolphoto.jpg
---

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# Blok-Lok: Columbus Tustin Middle School

[RainguardPro](https://blog.rainguardpro.com/projects/author/rainguardpro)

 Apr 11, 2025, 3:00:00 AM

**Where**: Tustin, CA

**Project** **Type**: Water Repellent

**Surface** **Type**: Split-Faced Block

**Products** **Used**: Blok-Lok

**Contractor**: McMillin Painting Inc.

**Warranty**: 10-Year Material Warranty

![](https://blog.rainguardpro.com/hubfs/columbus-tustin-middle-school-tustin-ca-2-schoolphoto.jpg)

At Columbus Tustin Middle School in Tustin, California, maintaining the integrity and appearance of the campus is a key part of creating a welcoming and lasting learning environment. The school’s exterior walls, made of split-faced block, were in need of protection from the elements, and [Blok-Lok Water Repellent](https://rainguardpro.com/products/blok-lok?variant=41839828762833) proved to be the right choice. Contractor McMillin Painting Inc. stepped in to complete the job, applying [Blok-Lok](https://rainguardpro.com/products/blok-lok?variant=41839828762833) to safeguard the school’s exterior from moisture damage and wear.

Split-faced block is a common and durable building material, but it’s also highly porous, which makes it vulnerable to water intrusion, staining, and the buildup of efflorescence. For a school campus, untreated masonry can quickly lead to long-term damage. That’s why Columbus Tustin Middle School opted to seal and protect its surfaces with [Blok-Lok](https://rainguardpro.com/products/blok-lok?variant=41839828762833), a high-performance silane/siloxane water repellent designed for masonry, wood, and concrete surfaces.

[Blok-Lok](https://rainguardpro.com/products/blok-lok?variant=41839828762833) forms a clear, natural-looking, breathable finish that repels water while still allowing moisture vapor to escape, preventing the kind of trapped water that can lead to cracking and structural issues. It also protects against efflorescence, mold and mildew growth, freeze/thaw damage, and it is UV resistant. Now, thanks to [Blok-Lok](https://rainguardpro.com/products/blok-lok?variant=41839828762833) and McMillin Painting Inc., Columbus Tustin Middle School has a cleaner, longer-lasting exterior that’s ready to withstand the elements for years to come.

 

Learn more about [Blok-Lok](https://rainguardpro.com/products/blok-lok?variant=41839828762833) by clicking the link below, or [request a free sample here](https://rainguardpro.com/pages/request-samples).

| [![BlokLok](https://blog.rainguardpro.com/hs-fs/hubfs/BlokLok.png?width=306&height=306&name=BlokLok.png)](https://rainguardpro.com/products/blok-lok?variant=41839828762833) [Learn more about Blok-Lok](https://rainguardpro.com/products/blok-lok?variant=41839828762833) |
| --- |

 

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### [Dec 13, 2024, 3:00:00 AM Blok-Lok: Yuba City Sewer Treatment Plant](https://blog.rainguardpro.com/projects/yuba-city-sewer-treatment-plant)

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