A simple rubber band placed vertically around a paint can’s rim prevents paint from accumulating and drying, maintaining a hermetic seal.
Room painting normally starts with enthusiasm but ends up being a sticky, rainbow-colored disaster. In between the spilt paint on the floor and the crust forming around the can’s rim, the process of cleaning may take more time than doing the actual job.
But there’s an easy tip that has been floating around the DIY community for the past twenty years or so: You don’t have to buy expensive equipment to ensure a clean working area.As the name suggests, the technique is very straightforward. Place a large rubber band around the paint can vertically to cover the open top in a way that makes a tight connection through the centre of the opening. In other words, you don’t need to wipe your brush across the metal edge, where paint collects and runs down the side edges of the can due to the presence of a sealing groove.
Just rub your brush against the rubber band instead of the metal edge, and extra paint will fall inside the pot.Physics behind a lasting effectUnlike many fleeting household tips and tricks, the rubber band technique survives thanks to the longevity that coating preservation chemistry brings to the method. It is not enough to clean the rim surface of the paint container because paint protection plays an essential role here. As it is described in the research paper Storage Stability in Paints and Coatings published by SpecialChem, the core of the hack is connected with the long-term integrity of the paint can.
These statements can be proven by the standards of the American Coatings Association. According to the Coatings Clinic: Solvent Properties report, solvent volatility is one of the important properties responsible for maintaining a proper viscosity level in paint. Paint accumulation near the rim disrupts a hermetic seal, which allows more volatile solvents to dissipate and thicken the paint or make it form a skin. In such conditions, a rubber band works effectively to wipe the edge and maintain a hermetic seal throughout the entire period of product storage.Materials science: why rubber and silicone are importantIt is necessary to note that not all rubber bands have similar chemical compositions to allow the use in certain types of liquids. While rubber bands from an office supply will be quite enough to work with water-based paints, the situation is different when it comes to solvent-heavy or oil-based ones.Scientific guidance in the Standard Specification for Standard Environment for Conditioning and Testing Paint, Varnish, Lacquer, and Related Materials, such as the ASTM D3924, suggests maintaining strict control of the chemical environment inside the storage container.
In cases when heavy-duty paint application requires working with an oil-based paint or thinner, experts advise using silicone bands. Being a man-made elastomer, silicone naturally resists the harsh effects of chemicals and volatile organic compounds often included in industrial paint formulas.
While natural rubber may eventually wear out under contact with specific solvents and become unusable as a wiping device, silicone maintains its performance properties, providing consistent edge throughout the entire day of work.
This technique, effective for both water-based and solvent-heavy paints (using silicone bands for the latter), preserves paint viscosity and prevents dried flakes from contaminating fresh paint, leading to a cleaner application and a more durable finish.
Avoiding “secondary products” and contaminationGoing beyond mere protection, using silicone also increases the quality of the outcome by eliminating the risk of chemical contamination. This topic is explored in the article titledComparison of the fading and surface deterioration of red lake pigments in six paintings by Vincent van Gogh with artificially aged paint reconstructions.This research demonstrates that the process of surface wear and degradation of paint into “secondary products” takes place in cases where the paint is subjected to varying conditions in the environment.
From the point of view of DIY painting, this means that paint which dries and creates a crust around the edge of a paint container is an example of such deterioration. Scraping a brush along the edges may allow flakes of such paint to fall into the new paint.Once deposited on the wall, they make the wall brittle and cause bumps to appear in the paint film. Using the rubber band to go around the rim means that the aged paint won’t be able to make it through the rubber barrier and into the paint can.
This way, the paint will be the same chemical composition as the first time around, which contributes to better application and resistance to degradation.The faster, eco-friendly alternativeWhen doing DIY work around the house, one may be tempted by fancy gadgets such as the plastic spout for pouring or paint trays. While there is some value to be had from them, there is also another downside, namely, cleaning after use.
A paint tray uses a lot of water or solvent to clean up, whereas a rubber band just wipes off or is discarded.The rubber band technique shows that sometimes the most straightforward concepts hold the most power. Take advantage of an object that you already own and a rudimentary knowledge of air-tight sealing to protect your floors, save your paint, and eliminate the biggest pain in the ass of cleaning up after yourself. No matter how experienced you are at painting or how new you are to using a brush, this small addition to your painting process could make all the difference.
