Polyurethane paint can be used to cover up cracks or other damage caused by water leakage. Polyurethane paints are very resistant to abrasion and they are not susceptible to rusting, cracking or peeling off. They do however require some care when handling them because of their high melting point (about 1,000°C). These properties make it necessary that the surface must be protected from moisture and dust.
The most common type of polyurethane paint is called “Acrylic” and it is made out of acrylic resin. Acrylonitrile butadiene styrene (ABS) is another popular kind of polyurethane. Both these types have similar properties: they are resistant to abrasion, corrosion and fading, but they differ in their resistance to heat.
For example, ABS melts at around 250°C while PVC melts at around 350°C. When using acrylic paint, you need to use special tools to avoid getting burned.
In addition, acrylic paints tend to peel off easily and are prone to chipping if left too long without being wiped off. If you want your floors to last longer, then you should consider painting them with a non-porous paint such as Krylon’s “Paint Stick”.
In addition to being resistant to abrasion, both kinds of polyurethane are resistant to water. However, ABS is slightly less resistant than PVC since it does not melt until around 500°C. When using a spray can for painting, the best way to prevent water leaks is by covering the area with a waterproof coating such as vinyl or polyester film.
If you are using an airbrush for painting, then make sure to use distilled water. Tap water may contain minerals that can clog the spray gun. This is particularly important when using vinyl or polyester film because they tear off easily and exposing more of the wall means exposing it to more moisture. If you are afraid of your paint peeling off, you can prepare the walls with a thin layer of plastic that can be peeled off once the painting is finished.
Krylon offers a variety of “Paint Sticks” which are made from slightly different materials and have different functions. They come in convenient packaging with a built-in easel to stand them upright so that the paint doesn’t dry out (but still lets the air flow, so you don’t end up with a can full of concrete).
The sticks are available in glossy or matte finishes; some are water-based, and some are oil-based. You can also find sticks that are pre-mixed, or those that come in tubes that you can mix yourself. The sticks are available in a wide range of colors, from subtle earth tones to vibrant reds and yellows.
The advantages of oil-based paints are that they dry slowly (allowing for more time to apply them) and provide a hard finish.
Sources & references used in this article:
- Biodegradation of polyurethane derived from castor oil (JM Cangemi, AM Santos, SC Neto, GO Chierice – Polímeros, 2008 – SciELO Brasil)
- Room temperature curable silane terminated and stable waterborne polyurethane dispersions which contain fluorine and/or silicone and low surface energy coatings … (GP Roberts, LW Holland, RG Hansen… – US Patent …, 2001 – Google Patents)
- Aqueous-only, green route to self-healable, UV-resistant, and electrically conductive polyurethane/graphene/lignin nanocomposite coatings (SI Seyed Shahabadi, J Kong, X Lu – ACS Sustainable Chemistry …, 2017 – ACS Publications)
- Surfactant-free emulsions for waterborne, two-component polyurethane coatings (J Huybrechts, P Bruylants, A Vaes… – Progress in Organic …, 2000 – Elsevier)
- Study of iodine releases from epoxy and polyurethane paints under irradiation and development of a new model of iodine-Epoxy paint interactions for PHEBUS and … (L Bosland, J Colombani – Journal of Radioanalytical and Nuclear …, 2017 – Springer)