If your finish keeps showing defects, treat sanding like troubleshooting: identify the scratch pattern, fix the coarsest issue first, then refine. This guide sands a rusty steel angle iron to remove rust and prep for weld-through primer with inspection checkpoints...
Different finishes need different surface profiles. To sand primer smooth for semi-gloss paint on a pine door trim, you’ll build a controlled scratch pattern from 120 to 320 grit. The goal is uniformity—not maximum pressure. Follow the grit order below...
3D Printed Pla Part sanding is easiest when you treat it like a repeatable workflow: remove the defects you can see, then refine the scratch pattern until primer or a topcoat can hide it. Below is a practical sequence to...