[Canarywood1]

Thanks irc, I appreciate the response. The gaps are as big as 1.5" in some areas, so I figured it might make the job look better if I used something cement-based to start. If I used a sealant of some sort, it would be a half-inch in some spots and 1.5" in others, so it wouldn't look uniform. I wanted to use my margin trowel to patch at a 45-degree angle all along where the sidewalk meets the foundation. If it cracks down the line, then perhaps I could use a sealant to seal up those cracks. Good idea/bad idea?

If you don't mind patching it now and then again when this patch opens fine,get a bag of grout from HD or Lowes and have at it.