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Pro tip: stop sanding primer with 400 grit and a bare hand, get a block
I did it the lazy way for years, folding a sheet of 400 grit and running my fingers over filler until it felt smooth, then wondering why my topcoat showed every fingerprint dent three coats deep. Last spring a painter named Dario at a shop over on Delmar told me straight up, "your hand is a soft block, that's the problem," and handed me a firm rubber block. Same paper, same primer, but now I spend 10 minutes blocking instead of 30 minutes chasing waves, and my 320 scratch pattern lays flat every time. It costs like 8 bucks and it saves me a full repaint maybe once a month. What grit and block combo are you all running on your feather edges?
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keithbennett26d ago
I've been running a firm rubber block too but I recently switched to a semi-rigid one for the last pass and it made a real difference. Dario's point about your hand being a soft block cuts both ways, because if your block is too hard you'll dig into the feather edge and leave a hard line. So I keep two blocks around now, a firm one for knocking down filler and a softer one for blending the edge into the panel.
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