Paint the terracotta tiles with latex paint.
Painting terracotta roof tiles.
Foam brushes are ideal for painting uneven terracotta surfaces while a foam roller makes short work of flat terracotta tiling.
Terracotta roof tiles are created from clay and fired with a glaze to provide a long lasting protective finish that contains an attractive sheen.
Once the firing is complete these tiles will withstand years of weather exposure when professionals properly install them on a roof.
If painter claims they can paint a terracotta roof then ask for manufacturers data sheet and double check the product is suitable and guaranteed for terracotta coverage.
Also to mention that any product guarantee will be lost.
Used in conjunction with any of the nutech paint top coat roof finishes such as nxt cool zone tileflex flexi shield and nuflex nutech paint can provide long term durability with guaranteed performance.
Nutech elite terracotta primer has been specifically formulated to provide superior adhesion and long term performance over properly prepared unglazed glazed and vitrified terracotta roof tiles.
Since you cannot paint terracotta roof tiles here is the terracotta restoration process.
The pros and cons of painting terracotta roof tiles.