Need advice on exterior painting

[jesm]

Hi. We completed a new home here last year, our second in Mexico. Our builder surprised me when he suggested that we apply a 50/50 mixture of Comex 5x1 sealer and water to all finished cement surfaces prior to painting. Our other home in bone dry Sonora had been given pure, 100% sealer before paint. It has worked well thru last summers intense rains, went on faster and of course saved a little money. For roof surfaces, bovedas and domes he liberally applied 5 year Comex impermeabilizantes.
Good luck with your new place.