How to paint a sandy concrete surface?

[melindayiu]

Hi,

My bath is really old and need to be repainted.  There are many chipped paint on the ceiling that I have removed.  The wall inside the shower probably is damp all the time.  I found a big thick patch of paint was loosened and I torn it off.  The underneath was probably sandy cement.  What is the step that I need to do before I repaint the wall?

The ceiling above the shower also has many chipped paint.  I tried to remove as much as I can.  What is the step before I repaint?  Should I use some waterproof primer before I repaint? 

Please kindly help.

regards,

Melinda

[JacobZ]

Hi @melindayiu,

A warm welcome to the Bunnings Workshop community and thank you for your question.

For the patch on the wall, use a wire brush to remove as much loose material as possible. Once tidied up, use Ardit Rapidset Repair Mortar to repair the surface. Once the mortar has dried, you should prime and paint the whole wall to get a clean, uniform look.

For the ceiling, you'll need to remove as much of the flaking paint as possible. This can be done with a 100mm Sharp Edge Paint Scraper. Remember that any primer and paint used will bond to the surface directly beneath it. Any flaking paint that remains will be the surface your new paint bonds to, so removing as much as you can is in your best interests.

You can use Dulux 1Step Prep Primer, Sealer & Undercoat to prime the surface, followed by Dulux 4L Interior Paint Wash&Wear +PLUS Kitchen & Bathroom for your paint.

Let me know what you think and if you have further questions, please don't hesitate to ask.

Jacob