Well, I think so, I did it to my normal converse and it was Harmless.
To make cardboard waterproof, you can apply a waterproof sealant or coating such as polyurethane spray, acrylic spray, or waterproof paint. These products create a protective barrier that prevents water from seeping into the cardboard.
To protect outdoor furniture from the elements using waterproof fabric spray, follow these steps: Clean the furniture thoroughly to remove any dirt or debris. Apply the waterproof fabric spray evenly over the surface of the furniture. Allow the spray to dry completely before exposing the furniture to rain or moisture. Reapply the waterproof fabric spray periodically to maintain protection.
What it can do is to make watercolor.(sometimes,it makes waterproof)
They possibly could be waterproof but just to make sure spray some anti wet spray on them so that way you are safe if they arnt. You can get this at the store that you got the shoes from.
Using waterproof spray foam for insulation provides benefits such as improved energy efficiency, reduced air leakage, moisture resistance, and increased durability.
To effectively waterproof a box, you can use materials like silicone sealant, waterproof tape, or waterproof spray. Apply the sealant or tape along the seams and edges of the box to prevent water from seeping in. Make sure to cover all potential entry points for water. Additionally, consider using a waterproof spray to add an extra layer of protection.
Gore-tex
The best way to waterproof a garden parasol is to spray it with a water sealant. You can buy this sealant at any hardware store.
One can buy waterproof hiking shoes at an outdoor equipment store, such as REI Outfitters. One can also buy a waterproofing spray and spray it onto standard hiking shoes.
you should let them dry for 2 to 3 hours before you wear them
To waterproof a paper sign, you can use a clear waterproof sealant spray or laminate the sign with waterproof laminating sheets. Both methods will help protect the paper from water damage and make it suitable for outdoor use.
To waterproof a cardboard box effectively, you can use waterproof sealant or coating such as polyurethane spray, waterproof tape, or waterproof paint. Apply the chosen waterproofing material evenly on all sides of the box and allow it to dry completely before use.