[legendlake]

What product is used to seal curbing and where is it purchased?

[villagetinker]

There several sources for 'sealant' however, you need to know the previous sealant type, some of these may not be compatible. For example, I have used HC water based sealant for the landscaping, but my driveway is painted with a xylene based paint and while I MIGHT be able to use the HC water based on the painted driveway I cannot use the Xylene based clear coat on the landscape.

If there was no sealant applied and you are dealing with 'stained' concrete, you can ask at the store what would be appropriate, then I would TEST an inconspicuous area. If this curbing was sealed, then I would ask what is this the least likely sealer to cause problems and do a test.

Hope this helps.