old bathroom floor, ugly as hell, i want to paint it
Any ceramic tile can be painted no matter if it is old or new. The most important thing is to make sure the tile is perfectly clean.Repair any cracked tiles and crumbling grout. If you need to regrout, do so before painting the tile. Regrouting will damage the paint.Water-based paints that contain a urethane resin are good paints to use.Do not apply it to ceramic tile that gets wet on a regular basis. Examples of this are tile surfaces inside a tub or shower area.You can use a roller to paint a ceramic-tile floor. I suggest a roller with a low nap to keep bubbles and texture to a minimum. You can also add products to the paint that allow them to flow well and attain a finish as if they had been sprayed. If you have a sprayer, you absolutely can spray the tile. Be sure to protect adjacent surfaces from overspray. Tape over grout lines with blue painter's tape if you do not want to paint the grout. It's much easier to paint the entire floor one color, but the decision is yours. If you plan on painting the grout, you should let it dry for 48 hours before painting.
I would use a disc sander if glazed tile to rough it up, then use an acrylic primer first.
