To resurface a floor tile, repair any damages on the tile, take out the trim and caulking, clean the tile, and etch its surface using dilute acid. Then, apply a bonding primer on it, and spray surface finish material. Finally, replace the trim and caulking.
Approximately one week before resurfacing the tile, apply a waterproof filling on any cracks or chipped areas on the tile using a putty knife and as per the instructions given on the label. Let the filling agent air-dry for a week.
Then, use a screwdriver to take out the caulking and trim from the floor's edge. Also take out the edging plates of the doors. Keep these aside safely for reuse.
To clean the tile, dilute 1/4 cup of bicarbonate or washing soda in 1 gallon of tepid water, sponge the solution on the tile with a sponge mop, and air-dry for about 20 minutes. With a mixture of dilute acid, scrub the tile's surface using a scratch pad.
Begin resurfacing the floor tile by applying masking tape on those areas that are not to be resurfaced. Roll or spray the bonding primer, and then spray three coats of the finish material. Let it dry for 72 hours. Finally, recaulk the floor, and restore the edging plates and the trim.