Hack and retile was my 1st option to redo the bathrooms but it'll cost 5 digits for 2 bathrooms....
Overlay was another and it was half the price. I've no experience with tiling but I've heard many people say there's a possibility tiles will pop up over time and overlaid tiles are not as durable...
Then, I came across an article on EPOXY PAINTING
Intrigued, I decided to find out more. You can Google "epoxy painting" or "polyurethane painting".
It was almost perfect! I had no cracks on my tiles, they were just discoloured, stained, porous, and I hated the original light blue anyway! So painting seemed a good and very affordable way to change the colour and waterproof the tiles at the same time!
Here's what I found out: epoxy painting is waterproof, mould-proof, doesn't discolour etc! In my painter's text to me:
"polyuretane epoxy paint is weatherproof and waterprooof.very durable.use for painting ships and metal bridges..can wash with detergent,clorox everyday..can last long for toilets except cannot push or pull heavy furniture on the paint coz it can scratch.."
So for $370/bathroom, walls and floor, what more could one ask for?
My total cost for 2 bathrooms came up to $3000 including all WC, basins, cabinets, shower sets, lights etc. Basically changed everything except the heater as it was still good and this brand with stainless steel tank is now defunct (it's so good, nobody changed their waters heaters!)
Oh btw, I had a great plumber. Really nice young chap and affordable & reasonable rates too. Fixed up everything in my bathroom incl WC, wash basin, cabinet, mirror, except the lights, shower which we DIY-ed using existing holes, and towel racks which my carpenter fixed. If anyone needs, here's his contact. Alvin: 9247 7110