Making cardboard waterproof is a complex process without any special chemicals. Again, as others have said, you cannot make the cardboard itself waterproof, but you can add another layer to make it waterproof.
Hello. How to Waterproof Cardboard Boxes? It rains all the time in our city and it is important for my business to keep the boxes dry. There are various ways to seal cardboard, but basically you will have to cover every part of it that ever gets into water or even moisture, and do it completely and without even tiny gaps.
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