Hi all,

It will affect the surface, yes. How much refinishing the mould needs will be determined by how well you can spray the PVA, but even the best coating will need a little bit of refinishing. PVA tends to run and fisheye worse than paint, so as FLD said you want to spray several light mist coats initially and let it dry completely between each. You can then spray heavier coats, but be careful not to try to load it on as heavy as you would a paint - it will run!