I would like to offer suggestions.
First, a painting store does not carry industrial coating systems. They carry paint which will never last more than eight years. most cases you will begin to deal with massive failure on the surface of stucco within two to four years. When this happens, you will be faced with more costs to try to remover the old paint than it cost to apply it in the first place. NEVER PAINT STUCCO! You have no idea of the damage to the look of your units and the cost of restoring the walls down the road.
Second, an elastomeric is the right direction, However, the name brand that you are asking about is sold by a distributor who sells one thing, and one thing only. Of course it is the solution for all your problems (it's all he has). With this company, as well as all others, you need to do a little background search. Right on this site, you will find a forum which allows people to comment on certain products or techniques. If you type in that company name and/or "liquid siding" or "liquid vinyl" you will be faced with some rather negetive advice as to the product you are asking about. Maybe thousands of complaints overall. You need to get away from the hype of "one solution" and check out all of the players. Watch for negetive press, but also watch for no press at all. Often, the low class players in the elastomeric industry are prone to change names, even three times in five years, and corp. identity for their protection. There is a lot of history in this industry, you need to get around the "also ran" players and get to the meat of the industry. If you do, you will end up with a Canadian product, as they invented the stuff. A few exist. As Peter Drucker says, "any newer technology brings with it a rush of "also rans" and then 25 years down the road, most are gone. This will be the case for elastomerics in the U.S. Unfortunatly, all the half wits will destroy this industry if people such as yourself don't remain vigilant. What happens is the "also ran" will decide he can create his own product and/or goes to the paint industry for his formulation. The U.S. paint industry will not formulate a long lasting coating system, even if they knew how to. Watch what you look at! Don't buy a suspect product! Follow science and require tested and MPI listed elastomeric coating systems with an acrylic base. Don't fall for a high stretch product ("it has a high stretch rate and stretches 600%)they don't allow natural vapor transmission!!!
Finally, as I stated, and elastomeric is the solution, but it needs to be able to transfer water vapor through it's rather durable skin. If not, it will bubble under hydrolic forces. Also, I said it would be Canadian because there are only two products like this which are tested and listed for government work etc. one has been around since 1960 and one since 1973, both have good track records, but the newer one has a direct sales force like the product you inquired about and would be 30% more expensive to cover commissions etc.
Lastly, expect to pay 3 times and more than paint. It will last many more times longer than paint so it will pay for itself over time, but don't paint. Either re-plaster or go with a quality elastomeric. Any questions please call 435-640-0283 and I'll give you the entire scoop