Since terracotta tiles are.
Painting terracotta roof tiles.
Even if you paint the top of the tile moisture can be sucked in from underneath and cause the paint to flake off.
Apply masonry primer to the terracotta tiles.
Clean the surface with a trisodium phosphate tsp cleaning solution and a rag.
Painted or coated as an application such as this would have trouble with any mechanical adhesion.
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.
I am not sure that painting terracotta roof tile is the best idea.
I was doing research as i was getting mixed answers and learned that terracotta is very porous.
Once the firing is complete these tiles will withstand years of weather exposure when professionals properly install them on a roof.
The pros and cons of painting terracotta roof tiles.
Use a nylon scrub brush or sturdy mop.
Change all broken tiles.
Rinse with clean water.
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.
Since you cannot paint terracotta roof tiles here is the terracotta restoration process.
Scrub the tile with a mixture of 1 part white vinegar to 4 parts water or use a mild grease fighting dishwashing liquid and water.
Terracotta roof tiles which have glazing evident should not be sealed.
Protect nearby surfaces with painter s masking tape and plastic sheeting.
The pros and cons of painting terracotta roof tiles november 4 2016.
How to paint on terracotta tiles step 1.
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.