Well, as usual I have had the intention of making tombstones all year....and haven't gotten around to it. Story of my life. So anyway, last year I bought a couple of stones from Spirit after Halloween and when I was at Michaels last night I saw they had a 3 pack that didn't look overly cheesy. So my question is, if you have store bought stones, do you leave them as is or do you add to them? Also, do you do anything to help weatherproof them?