You can paint a rock if you properly prepare it for its new finish. Unlike wood, rocks are not porous. Typically, a rock will shed any sort of painted finish within days or weeks of application. To generate a finish that lasts, thoroughly condition the hard, dense surface for better adhesion. Meticulously follow the proper preparation procedure, or flaking and peeling will prove unavoidable.
Instructions
1. Wash each rock with a water-based soap. Scrub every bit of dirt from the rock, using steel wool. Don't leave any oil, dust or grime on the rock or it will be difficult to achieve adequate primer adhesion.
2. Thoroughly rinse all the cleanser from the rock, using a pressure washer. Don't use wet rags or you may leave soapy residue behind, which will significantly inhibit adhesion. Don't proceed until the rock is completely dry.
3. Coat the rock with a shellac-based primer, using the proper paintbrush. Synthetic brushes aren't suited for shellac primers; use a natural-bristled brush. Shellac primer is prone to sagging and runs. Carefully survey the rock for flaws and smooth these, using the brush.
4. Wash out the brush, using only denatured alcohol.
5. Let the rock dry for two hours before applying paint.
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