keep shells in open container in fridge. When full, crush shells into small bits and sprinkle around base of plants. Sharp eggshells will deter slugs, snails, and other bugs from nibbling on garden and add touch of calcium to soil.
So I looked at this before spray painting some wooden picture frames and a few other items. I started sanding and hated it, so I just used primer and then painted. Hope it doesn't turn out like her coffee table.