I'm starting to finish my basement. First step is sealing up some various places water has come in over the years. I've already fixed grading outside, but also want to seal inside.
I have one crack that I've seen water come through after heavy rains. For that I've purchased an expanding polyurethane product that goes under a layer of epoxy to force it into the crack (http://www.radonseal.com/crack-injection/diy-injection.htm).
I have several other cracks that show no evidence of water intrusion, but I'd like to seal them to be safe. I'm looking at a normal polyurethance concrete caulk (e.g. http://www.loctiteproducts.com/p/pl_seal_cms/overview/Loctite-PL-S10-Polyurethane-Concrete-Crack-&-Masonry-Sealant.htm) for these.
Obviously for the crack I've seen wet I want a good deep fill, but for the others I'd rather pay $0.20/linear foot for the Loctite than $10/linear foot for the expanding one. Will the cheaper option still provide a decent seal, or is it worth $600 to use the expanding one everywhere?