Here is a video I taped showing using the inferior blacktop crack filler in a normal caulk tube: When I installed it, I did push some small stones into the gooey caulk to help disguise the repair, but you could still see it if you looked closely. I installed some on my drive five years ago and it looked pretty good after three years, but then it started to succumb to the stresses of harsh New Hampshire winters and the punishing ultraviolet rays of the sun. My second-last blacktop crack filler was a special caulk that had small pieces of silica sand in it and was extremely sticky.
When you then fill the crack in your blacktop with a monotone-colored product such as deep-black caulk, you bet that black line stands out like a sore thumb. Over time, Mother Nature washes away the black asphalt from the surface and you see the different colored pieces of stone and sand. This is because each piece of stone and sand in the mix has been coated with the black asphalt cement that's the glue holding the stones and sand together. When a new blacktop drive is installed, it's jet black. I know what you mean about the repair looking worse than the crack. The crack repair looks bad in most cases because the repair doesn't match the color and texture of the adjacent blacktop. It just so happens I believe I may have found it. Over the years, I've tried many different products looking for the Holy Grail of crack fillers. While the sealer job came out great, the crack-filling experiment ended in a dismal failure. The drive had some cracks so we just mixed up some sand with the liquid blacktop sealer and poured that into the cracks.
The worst blacktop crack filler is a mixture of sand and blacktop sealer. Never having done it before, we said "Yes" and figured it couldn't be that hard. One homeowner asked us while we were painting her house if we could seal her blacktop driveway. When I was in college I started a house painting business with a good friend. DEAR KATHY: I used to struggle with blacktop crack repairs too.
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