Our contractors have used cement look grey matte tiles for one of the small guest bathrooms - without consideration of the amount of natural light coming in, which is very low. Makes the bathroom look small and dingy rather than rugged and industrial as expected. I have seen a few videos of people DIYing abroad, painting over bathroom tiles to brighten it up. Can it be done in India? Which type of paint would be ideal for this project? They are matte, stone/cement look smooth 1200x600 tiles with minimal grouting.