what is the best paint to cover indoor, terra cotta tiles. they have
been painted, but are badly scraped. must I use a primer? A sealer?
i want it to last. home use. I need the reasons why you recommend it,
pls.

I came across this on the Homestagers.co.uk website:
   
"Any tips on how to modernise unattractive terracotta tiles on our
interior window sills?
Kari from The South asked:
We live in a 1950s house with interior window sills consisting of
not-very-attractive terra-cotta tiles. Any tips as to how to disguise
or replace them easily before selling? The red terra-cotta tile paint
you can buy is such an awful colour, I think it would make matters
even worse. Otherwise our house has been greatly modernised and is
light and airy.
   
HOME STAGERS TIP
Tina Jesson Principal Home Stagers Consultant, gave this tip
Hi Kari,
A difficult problem. I would use a white tile primer and then a paint
and treat them as though they where ceramic. It would certainly make
the windows appear lighter. Alternatively, they could be replaced with
a traditional wooden sills.
Hope that helps,
Tina"
http://www.homestagers.co.uk/tips/advice/qa/question.php/79?PHPSESSID=05babfc698ad9ba4276ea1970b28e395