Few tricks I've discovered so far: press the grass into the wet paint, let sit over an hour, then vacuum. I use a shop vac, but I've taped a funnel into the vacuum hose, and in the funnel I've taped a paint strainer. It collects the loose grass but doesn't suck it past. Allows it to be collected and put back into the pan I have it in. I've got washers taped around the edges, too, so it doesn't stick to the board, but instead gets really close with out suctioning down.
Radii are a roll of tape, a washer, a paint can, and a straightened hose clamp. Not the most extravagant tools to make a decent looking product.
Gap between the edge of the ties and the grass is the thickness of a paint paddle.
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