Ever wanted to pack products in a custom cardboard box? If yes, then you may be worried about how to make it waterproof.
Cardboard is a versatile, super-safe, and lightweight packaging material that can be used for the packaging of delicate & high-value items.
Keep reading to know how to make cardboard waterproof, and once it is waterproofed, how you can save your precious items for maximum protection.
How to Make Cardboard Waterproof?
How do you waterproof your cardboard boxes? Here are some techniques through which you can waterproof your cardboard packaging for better presentation and protection.
1. Fiberglass Resin
For those who ship their products in cardboard packaging and face extreme outdoor weather conditions, fiberglass resin is one of the best options. This protects products from heat and rain and provides better durability.
A tough coating layer avoids moisture and is best suited for outdoor and long-term uses. However, this is expensive and needs careful application because its application process is complicated.
2. Use Waterproof Spray
This is honestly the easiest method, especially if you need a quick fix. Waterproof sprays like polyurethane or acrylic sealant sprays are widely available at hardware stores and online.
How to do it?
- Lay your cardboard flat on a clean surface.
- Spray an even coat across the entire surface.
- Let it dry completely, like 1 to 2 hours.
- Apply a second coat for stronger protection.
The result is a light, clear coating that repels water without changing the look of the cardboard much. It's great for smaller projects, packaging inserts, or custom display boxes.
3. Apply Waterproof Paint or Acrylic Paint
To get a waterproof coating with some style, try acrylic paint; its effectiveness will surprise you. The painted surface becomes impervious to water due to the creation of a plastic film after drying.
This solution is particularly useful when making customized gift boxes or retail packaging for products made from cardboard. Apply two to three coats of paint and wait for each coat to dry before applying the next one.
4. Use PVA Glue
The adhesive that everyone knows from elementary school is PVA glue. It turns out to be an extremely good water sealant if applied properly. The resulting coating will be pliable and moisture-resistant.
Take equal parts of PVA glue and water and apply it on the cardboard in layers, allow to dry completely, and reapply two to three times. This is a very inexpensive, simple, and effective way to waterproof cardboard.
5. Use Wax
In fact, the use of wax to waterproof cardboard is considered one of the most traditional techniques, dating back for ages. This technique can be carried out with wax of candles, beeswax, or paraffin.
Just smear some wax onto the surface of the cardboard and then melt it using a heat gun or hair dryer.
This method involves no toxic substances whatsoever and gives the cardboard surface a smooth matte look.
Tips to Get the Best Results of Waterproofing
The following are some things you need to keep in mind to get the best results.
- Always begin with dry cardboard. It is impossible to waterproof wet cardboard.
- Use several thin layers instead of one thick layer.
- Make sure that you cover all the edges and corners because they are the weakest areas.
- Always test your waterproofing method before applying it fully.
Ending Words!
How to make cardboard waterproof? Cardboard doesn’t have to be brittle. By employing appropriate techniques for waterproofing cardboard, one will not only be able to protect cardboard from moisture and humidity but will also ensure that it won’t disintegrate after light rains.
From securing shipments and protecting personal crafts to safeguarding business products, these techniques will enable cardboard to withstand the rigors of its own brittleness.
And the good news is that most of these techniques are inexpensive and straightforward enough for anyone to use. Ready to elevate your packaging and make your brand stand out? Explore premium custom packaging solutions at Custom Boxes Inc. and bring your ideas to life today.
