You want to protect yourself and use the same process for everyone so that you are not discriminating with your 1st batch of potential renters.  

Wait and see what their next batch says:)

the first two posts are a great suggestion, just want to throw another option at you to consider, you can use a grinder with a concrete blade and use it like a sander and blend the batch into the original wall area to make the patch blend in better with the wall then use a basement paint like Drylock or a water proofing that is painted on the walls, its a little thicker then just concrete paint and will help to cover up the patched area.

We actually just sent out a batch a couple of days ago and we had several calls yesterday and a website lead.

Today i sent my first batch of mailings as i`m prospecting for a SFH 3 bed 2 baths between 1100 sqft and 1600 sqft, i pulled a list of 500 absentee owners that bought their property before 1997, i`m marketing to them with a classic yellow letter with A2 Ivory invitation envelope, i hope to get around 5% response, i will also follow up with a postcard, a white letter and a zip letter once a month before i drop the list and move to the next one!

Brandon Foken Off of my first batch i mostly got curious callers asking about what i did and asking for a free appraisal.My second mailing (of 500) I got my first motivated lead, a very motivated lead.

I just got my materials for my yellow letters in so I'll be sending my first batch out soon.

Dont worry, a new batch will take their place.......

Most probably answer I can see is one concrete truck ran out of concrete mid pour and they had a second truck come in to finish the pour and the second truck's mix had a different level of water content or one truck had calcium chloride added to the crete - or there was a dye that got into one of the concrete batches.

I did bid on a couple of residential vacant land in Urban area.I use Land use code and lien face value range to filter all properties I like.After putting together a list, I start doing research one by one by using county office website, google maps, Zillow and EPA website.I bid at 5-8% for first three batches but got nothing because winners for properties I bid on are at 2%-4%, some even 1%.I adjusted my bidding rate for later batches.I won 8 bids in total. 7 of them are properties with house on it at low rate. 1 of them is residential vacant land at higher rate.I made payment for all my winning bids on the day of results.waiting for tax lien certificate.....Hope this is helpful to other newbies.