We are having the outside of the Church painted (not too sure I am impressed) but as part of the specification we asked (on the advice of a builder) for the old painted render to be cleaned down to remove all visible traces of algae, etc. and then a suitable fungicide to be applied before the paint.
I got back from work tonight to find they have painted about 50% however at the edges of the new paint I can see the odd signs of dirt/algae and no visible signs of a fungicide.
My (limited) experience is that a fungicide wash would leave slight stains/water marks on the old painted render.
Anyone give me any tips as to what to look for and, if they haven't applied it, what action should we take?
Many thanks