Almost always, the answer is mixing. RustSeal Satin Black and every other matte sheen of RustSeal are heavily pigmented, and the matting agents settle to the bottom of the can in storage. If those agents are not brought fully back into suspension, the coating goes on with more gloss than it should. Applying too heavily and judging the sheen too early are the other two causes.
Mix It Properly
Use a mechanical mixer on a drill, such as the KBS Hurricane Paint Mixer, or at minimum a paint stir stick. Effective mixing means repeatedly touching the bottom of the can and lifting, so any settled pigment and matting agent is fully dispersed. Stir for several minutes, then keep stirring every 15 to 20 minutes while you work, because the agents begin settling again as soon as you stop.
Turning the can upside down briefly before opening, or gently shaking it, helps. Avoid violent shaking: that produces air bubbles that affect both the seal and the finish.
Apply Thin Coats
Apply RustSeal in thin coats only. Medium or heavy coats make the finish look glossier than intended, and thin coats give better rust prevention and adhesion anyway. For a flatter result you can reduce RustSeal up to 20 percent with KBS #1 Thinner or Xylene, which increases matting and improves flow and leveling at the same time.
Give It Time Before You Judge
When first applied, RustSeal Satin Black can look glossier than expected and then matte down as it cures. Allow the full 24 hour cure before evaluating the final sheen. Judging too early, especially in cool or humid conditions, leads to unnecessary recoating.
Frequently Asked Questions: RustSeal Satin Black Sheen
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