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Use foam backer rod to fill the large gap then use a rubber caulk.
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The sealant you are looking for is Sonneborn NP-1. It is a self leveling sealant made for sidewalk and conditions just like this. You need to prep the joint with a wire brush, get it as clean as you can. Push foam backer rod so it is recessed about 1/2" below the surface of the walk. Dam up the ends or the NP-1 will flow out the end. Make sure you don't touch the joint for 24 hours. Sonneborn can be found a most construction supply houses. It comes in about 8 different colors and isn't overly expensive. If you have a large tube caulking gun it comes in the large tubes and goes further before you have to replace a tube.
Eric
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(08-22-2018, 11:00 AM)Eric Commarato Wrote: The sealant you are looking for is Sonneborn NP-1.
Amazon has it.
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We used tar at work and the weeds defeated that. It is easy to kill the plants when there are leaves around, but much harder when there are none. It is clear to me that the ground has to be sterile before sealing it with anything or the weeds will defeat the seal.
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I would still make an effort to sterilize the soil and kill off the dormant seedlings. I've read that a black plastic sheet over the area in the summer will generate enough heat to accomplish this. A Google search for "sterilizing soil" will show instructions.
We used to do this by saturating the soil with gasoline and lighting a fire, but I think that would not be recommended in 2018.
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