I am from Mexico, just crossing the border of Brownsville, TX. Like 15 years ago I brought a house in Matamoros, Tamaulipas, Mexico. This is a production house made by Infonavit, a government agency made for low-income families. After suffering for around 5 years of severe hot weather and with little money to invest on my home, somebody told me about a paint that rejects the heat and only cost about 60 dollars.

So I went to buy it, the salesman told me that the paint contained some pearls that reflect the sun rays and I could not put another coat of paint on top of it so it can work. My house it was made out of blocks, and concrete ceilings no insulation at all and no money not even to think to do that. On hot days the wall that the sun hits it was really hot to the touch and the ceiling too. After I paint the wall with that paint, the wall did not even feel warm at the same hour the next day, on the ceiling a apply a white waterproof paint that do not recommend for walls and it worked too.

10 years after I have another house, I apply the waterproof paint to the ceiling but the wall paint, I do not know the brand name of it, and nobody were a live know about it either, so I was researching for it on internet and I find several paints that are like the salesman told me, and when I am looking for a review on them to see which one it is the best, you tell me that none of this ones work even if it’s the same principle.

Now I have a big doubt that they are going to work even if I know it did. What do you recommend me buy it or use another way to get rid of the heat on the walls? And if you recommend me other system can you tell me one that it is not to expensive to do? Thanks.