Hey guys.... My daughter and I garbage picked a desk, and we are stripping it and painting it. We stripped it with zinsser strip fast, then sanded it. I am using my rockier hvlp spray gun set for the first time to apply the finish. I have thinned zinsser fast prime 2 down with drinking water to the viscosity that the sprayer recommended. As I was applying the primer, it was changing a lite shade of pink before my very eyes.... Could this be from something that was left on the desk? Or did I thin the primer too much? Should I have used distiller water to thin the primer(and any more latex paints I use in the future )?