How to fix interlock

Hi,
I would like this spring to fix my driveway interlock as in between stoones I see lots of grass growing. Question I have are: 1. Do I have to use elctric/gas preassure cleaner to get rid of grass and other debris between interlock. 2. What type of sand should I use to fill up gaps in between stones. I do know that there is a special interlock sand, but there is on for 4$/20Kg band and there is another for 16$/bag. Homedepot staff was usless there explaining. I did hear that more expensive sand gets very hard, but now sure about that. Anyone had experiece in this? 3. Is it a good idea to seal interlock after fixing it? I am not sure how to do that? Just spray with some special liquid?
Thanks
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stoones
YA RIGHT, special interlock sand, I have a bridge I would like to sell you. Humor Yes there are different grades of sand, but intelock stone sand. Nope not buying it. The more expensive is usually cleaner and finer, that is what makes it compact better.
but there is on for 4$/20Kg

sure
If you want the sand to get hard just sweep it in and water it. A light mixture of cement say 1 part to 4 of sand will make it harden up. This will effect how the drive way drains so it may not be a good idea. If you somewhere it freezes definately not a good idea, IO

to
If you have grass in-between the stones you need to kill the grass first. I have seen bermuda grass roots 10 feet deep. I would start out with a flame thrower, humor again. Get one of those big torches from Harbor Freight, like <$30.00. Burn everything then, then dig at the cracks with a thin putty knife pull out all the soil you can. Then use Round Up or your favorite grass killer, several times. This will take several applications and you may be able to finish by fall. Replacing the sand and or use of special liquid before the grass is dead is a waste of time.
I wanted a natural desert landscape in my back yard. I burned the grass every other month for over a year before I put down the stone. Still looks good and no weeds or grass.
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Spray all the weeds and grass with Roundup after its all brown in a few weeks get a propane torch , the one that is 3 ft long like a cane and burn everything , then fill with sand.
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