Styrofoam coolers are a popular choice for outdoor activities, picnics, and camping trips due to their lightweight and insulating properties. However, these coolers are not naturally waterproof, and over time, they can become susceptible to water damage, leaks, and even mold growth. In this comprehensive guide, we’ll explore various DIY methods to make your Styrofoam cooler waterproof, ensuring it remains a reliable and long-lasting companion for all your adventures.
Understanding Styrofoam and Its Water Resistance
Styrofoam, also known as expanded polystyrene (EPS) foam, is a lightweight and highly insulating material commonly used in the construction of coolers. While Styrofoam is water-resistant to a certain degree, it is not entirely waterproof. The porous nature of the foam allows water to gradually seep in, leading to potential damage and reduced insulation performance.
To address this issue, we’ll delve into several effective methods to enhance the water resistance of your Styrofoam cooler, each with its own set of advantages and considerations.
Waterproofing Methods for Styrofoam Coolers
1. Elmer’s Glue and Epoxy Paint or Resin
One of the most straightforward approaches to waterproofing a Styrofoam cooler is to use Elmer’s School Glue as the base, followed by a layer of epoxy paint or resin. This method creates a hard, plastic-like coating that is thin enough to preserve the cooler’s details and appearance.
Technical Specifications:
– Elmer’s School Glue: Typically available in 4 oz. to 1 gallon sizes, with a coverage of approximately 100-300 sq. ft. per gallon, depending on the application method.
– Epoxy Paint or Resin: Epoxy coatings can provide a durable and water-resistant finish, with coverage ranging from 200-400 sq. ft. per gallon, depending on the product and application.
2. Polyurethane Coating
Another effective method is to apply a polyurethane coating to the Styrofoam cooler. Polyurethane is a versatile and water-resistant material that can be sprayed on for a more even and consistent application.
Technical Specifications:
– Polyurethane Coatings: Available in various formulations, such as water-based or solvent-based, with coverage ranging from 300-500 sq. ft. per gallon, depending on the product and application method.
– It’s crucial to use a non-solvent-based polyurethane glue to avoid damaging the Styrofoam.
3. Sheet Plastic and Gorilla Tape
For an additional layer of water resistance, you can re-wrap the Styrofoam cooler in sheet plastic from a home improvement store and seal the seams with Gorilla Tape. This method creates a physical barrier to prevent water absorption, particularly useful for coolers that will be frequently exposed to water.
Technical Specifications:
– Sheet Plastic: Commonly available in various thicknesses, such as 6 mil or 10 mil, with widths ranging from 3 feet to 10 feet.
– Gorilla Tape: Typically comes in 1.88-inch or 2.88-inch widths, with a strong adhesive that can create a durable seal.
4. Spray-On Bedliner
Applying a spray-on bedliner to the exterior of the Styrofoam cooler can provide a durable and water-resistant barrier. This method is particularly effective for thicker Styrofoam coolers that are designed for long-term use.
Technical Specifications:
– Spray-On Bedliner: Available in various formulations, such as polyurethane or polyurea-based, with coverage ranging from 50-100 sq. ft. per gallon, depending on the product and application.
– Bedliner coatings can provide a textured, non-slip surface, adding to the overall durability and water resistance of the cooler.
5. Aluminum Foil
As suggested in a Reddit thread, using aluminum foil as an impermeable barrier can help prevent water absorption in Styrofoam coolers. However, the long-term effectiveness of this method is uncertain, especially when exposed to chlorine or bromine.
Technical Specifications:
– Aluminum Foil: Typically available in rolls with widths ranging from 12 inches to 18 inches, and thicknesses from 0.0009 inches to 0.0015 inches.
– The ability of aluminum foil to provide a lasting water-resistant barrier for Styrofoam coolers is not well-documented, and it may not be as effective as the other methods mentioned.
It’s important to note that while these methods can significantly improve the water resistance of a Styrofoam cooler, they may not make it completely waterproof. The level of water resistance required will depend on the intended use of the cooler, such as whether it will be submerged in water or exposed to heavy rainfall.
Conclusion
Styrofoam coolers are a practical and affordable choice for outdoor activities, but their inherent water-resistance can be a concern. By following the DIY methods outlined in this comprehensive guide, you can transform your Styrofoam cooler into a more water-resistant and durable companion. Whether you choose to apply Elmer’s Glue and epoxy, use a polyurethane coating, or explore other techniques, you can ensure your cooler remains a reliable and long-lasting investment for all your adventures.