If your in a major metopolitan area, look in the phonebook yellowpages under Flooring supplies, Carpet supplies, or carpet distributors, or flooring and carpet tools. Something to that effect. There should be a distributor, that will sell you floor patching compound. Lowes carries Mapei PlaniPatch

I use pool plaster. It needs to cure underwater before being painted.

Here's an interesting article: Here is a link that might be useful: hole repair-expanding

LetÂs get this straight so the others reading this thread are not as confused as some seem to be; as I understand your post the $1,500 is for the demolition, removal, replacement and finishing of an entire section of the garage floor. My guess would be, (you didnÂt say) thatÂs probably a minimum of around 1.25 to 1.85 cubic yards depending on a thickness of 4 or 6" if we assumed a 10Âx10Â area, of which the area depicted, is only a small portion. And while I think that $1,500 is a bit pricey, I would doubt that anyone would do it for less then $1,000 when you consider manpower, equipment, haulage and disposal of the spoils, and time required for finishing. Two things would be helpful, a photo of the entire section of the slab and a note as to what region of the country you are located in. It is plain to see from the photo that this is not a simple crack in the concrete, or if it was it is no longer, the concrete has been undermined, there are hydraulic forces at work there. From your photo, or probably any photo for that matter it is impossible to tell to what degree the substrate of the bulk of the slab has been impacted. But letÂs assume the rest of the slab and its substrate is good, I would still not call this a smear on some patch and walk away job. I would saw cut back to uncorrupted concrete, remove the junk, and take what ever steps were necessary to firm up the effected substrate (dig it out and bring it back up with crushed stone). I would then bore and epoxy a couple dowels into the existing good concrete, apply a bonding agent to its cross-section and then pour a fresh 4000 or 5000psi mix. I know that may sound daunting, but it is not as bad as all that, for me it would be maybe a 2-hour job, the fact that I have the tools is a help. But even for anyone with rented tools I couldnÂt see you spending more then half a day at it. Of course none of this is of any use (in time) if you donÂt correct the issue that caused this problem to begin with. And by the way, a word of caution, if you do decide to smear on some patch walk away and say "you canÂt see it from my new house", then I would be sure and disclose this to the purchaser. Because if the substrate of that entire section of slab is eroded and a month later it collapses in I know my attorney would be questioning your prior knowledge. I know just enough about concrete to be dangerous, here is one of the more recent projects I worked on. http://i90.photobucket.com/albums/k269/punk_itup/5dbc0126.jpg