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Preparing your surface is a key step to ensuring the success of any resin-based waterproofing project. Sanding may seem like an extra task, but it often makes all the difference for a durable, lasting result.
Why Sanding Is Essential
Sanding is highly recommended—especially on porous surfaces such as wood or concrete—before applying a resin waterproof coating. This step removes surface imperfections, old finishes, and loose material while providing a slightly roughened profile. The increased ‘tooth’ allows the resin layer to grip more firmly, reducing the risk of future peeling or uneven coverage.
On smoother surfaces, such as tiles or previously sealed areas, a light abrasion can also help improve adhesion. Just be sure to thoroughly remove dust after sanding.
How to Sand for Best Results
- Choose the right grit: Use medium grit (around 120–180) for initial preparation, finishing with fine grit if a smooth finish is needed.
- Sand evenly: Ensure the entire area is abraded, paying special attention to edges and corners.
- Clean thoroughly: After sanding, clear all dust and debris using a brush or vacuum followed by a damp cloth. Let the surface dry completely before applying resin.
For restoring and waterproofing wooden surfaces, using a product like EpoxyWood is ideal—but surface prep will always lead to better results, whichever resin you choose.
When Is Sanding Most Important?
Sanding is crucial anytime you’re aiming for maximum resin penetration and longevity—such as with weather-exposed wood, high-traffic concrete, or decorative wall coatings. It’s less vital on brand-new, already-rough concrete, but still beneficial for consistency and finish quality.
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Taking the time to sand before resin application helps ensure reliable, long-lasting waterproofing. For more tips on waterproofing with resin, return to our main waterproofing guide.