What is an important step when adding materials into the spraygun cup?

Using a strainer before adding materials to the spraygun cup is crucial for ensuring that the paint or other materials are free from debris and contaminants. Straining the material helps to filter out any grit, dried paint, or lumps that could clog the spraygun nozzle, leading to a more even and smooth application. This step is essential for achieving a professional finish and avoiding problems during the spraying process, such as uneven coverage or splattering.

While mixing paint directly in the cup can seem convenient, it can introduce air bubbles or create an uneven mix. Adding thinner before paint, while sometimes necessary depending on the specific material being used, is not universally applicable. Using a funnel may assist in pouring, but it does not address the critical need for filtration of the material being used in the spraygun. Therefore, the act of straining the material stands out as the most important precautionary measure when preparing spraygun materials.