They will have to dig down around the entirety of the structure to redo the drainage pipes and apply the sealant-it is not cheap! 

I would not require any structural improvements to the slab at this time, but I would recommend the owner maintain the following items in the future:Maintain grading around the foundation of the house per the attached specificationsKeep soil near the foundation walls moist during dry weatherExpect cracking in floor, and seal with flexible sealant when visibleThe proposed maintenance is designed to retain strength of the foundation.

I want to ask about this because no way is anyone drilling through my shingles, I don't care what kind of "forever" sealant they claim to use to keep water from leaking through the hole.

I feel like if I try and replace the pipe I risk opening up more issues, that is why I was just going to clamp it with a sealant.

I can't imagine how a sealant could waterproof joints that move, expand and contract. 

I wanted to see if anyone out there in the BP world had any suggestions as to the type of sealant/epoxy I could use for this

Concrete floors can show wear, and the sealant/gloss can get scratched like other surfaces.

But if you seal down the replacement patch you put in down hard to the shingles underneath with good sealant as you go, your problems, if they're anything like mine, are all over for a very long time.I wouldn't deal with getting the seller to address the leaks at all.

I feel like the floor has to be fine since so much sealant on it. 

Primer, paint, trim paint, ceiling paint, basement paint, brush/rollers/trays, Caulk/Sealant and Misc.Or my example house this came in at $1,100.00.11.)