SEMCO Liquid Membrane Plywood Waterproofing



Plywood, the unsung hero of construction and DIY projects, provides unmatched versatility. However, its Achilles' heel is water vulnerability. The good news? Waterproofing plywood is not just possible; it's a strategic move that can significantly extend its lifespan. In this blog post, we'll explore the effectiveness of SEMCO Liquid Membrane, a powerful waterproofing product, and guide you through the process of preparing, applying, and mastering the art of waterproofing plywood.

Can Plywood Really be Waterproofed?

Absolutely! Waterproofing plywood is a smart and proactive strategy to shield your projects from the potentially damaging effects of water. Whether you're working on outdoor furniture, decks, or marine applications, safeguarding your plywood against moisture is a game-changer for its longevity and structural integrity.

The Magic of SEMCO Liquid Membrane

  • Durable Protection
    SEMCO Liquid Membrane creates a weatherproof and flexible barrier on the plywood surface, providing durable protection against moisture. Its advanced formula is designed to repel water effectively, preventing issues like warping, swelling, and rotting.

  • Versatility
    Whether you're working on a deck, outdoor furniture, or marine plywood, SEMCO Liquid Membrane proves versatile in its application. Its adaptability makes it a go-to choice for a range of projects exposed to different weather conditions.


  • UV Resistance
    One standout feature of SEMCO Liquid Membrane is its UV resistance. This quality protects the plywood from sun damage, ensuring that it retains its original appearance and color even under prolonged exposure to sunlight.


  • Ease of Application
    SEMCO Liquid Membrane is user-friendly, allowing for easy application with a brush, roller, or sprayer. Its simplicity in use makes it accessible for both DIY enthusiasts and professionals.

How to Prepare and Apply Semco Liquid Membrane

  1. Surface Preparation
    Before applying SEMCO Liquid Membrane, ensure the plywood surface is clean, dry, and free from any contaminants. Remove dirt, dust, or remnants of previous coatings. This initial step is crucial for optimal adhesion and the effectiveness of the waterproofing.
  2. Application
    Use a brush, roller, or sprayer to apply SEMCO Liquid Membrane evenly across the plywood surface. Pay extra attention to seams, edges, and joints to ensure comprehensive coverage. We always recommend using Fabric Reinforcement on any joints or seams prior to applying a coat to the entire surface. 2 coats at a total thickness of 30-40 mils is required.
  3. Drying Time
    Allow the first coat of SEMCO Liquid Membrane to dry before deciding applying the second coat. Drying and curing times vary depending on temperature and humidity.Follow the product guidelines for recommended drying times. Patience during this stage ensures the formation of a robust and effective waterproof barrier.

Tips for Waterproofing Plywood Successfully

  • Follow Product Guidelines
    Always adhere to the guidelines provided by SEMCO for their Liquid Membrane. These guidelines offer specific instructions on application, drying times, and any additional steps required for optimal performance.

  • Apply in Suitable Conditions
    Choose a day with favorable weather conditions for application. Avoid applying SEMCO Liquid Membrane in extreme temperatures, high humidity, or direct sunlight. Ideal conditions provide the product with the right environment to bond effectively with the plywood surface.

  • Inspect and Repair
    Before waterproofing, thoroughly inspect the plywood for any damage or defects. Repair any issues before applying SEMCO Liquid Membrane to ensure a seamless protective layer.


Waterproofing plywood with SEMCO Liquid Membrane is not only feasible but also a strategic step towards enhancing the longevity and resilience of your projects. The product's durability, versatility, UV resistance, and ease of application make it a standout choice. By following the proper preparation and application steps, along with some helpful tips, you can master the art of waterproofing plywood, ensuring that your creations withstand the tests of time and the challenges of exposure to the elements.