What primer to use on wall?

[Phat]

i had a newly rendered wall which had been painted but then decided to roughly grind it back to prepare primer to for best adhesion to tile it, wife then changed her mind now to just paint the wall so now need to re render walls, what primer should i use???? The render took off only a mm more or less, still has paint … help please

[EricL]

Hello @Phat 

Welcome to the Bunnings Workshop community. It's sensational to have you join us, and thanks for sharing your question about your rendered wall.

If you want to paint the wall, I suggest using Dulux 1Step Prep Primer, Sealer & Undercoat 4L to prime the surface. This primer will work for both internal and external walls. My best advice is to allow the primer to cure to full strength before you put on the top coat.

If you have any other questions we can help with, please let us know.

Eric

[MitchellMc]

Hi @Phat,

Just to clarify, it sounds like the wall is rendered, and it was then painted. Subsequently, you've ground it back, revealing some cement, but there is paint left in between the stippled surface. Is that correct?

I am not aware of any primers that will allow you to render over a painted surface. So, you'd need to grind back the surface entirely to remove the paint and re-render over the cement.

Given the amount of work involved, you might like to revisit the idea of tiling.

Please let me know if you have any questions.

Mitchell

[Phat]

 

Hi Mitchel that is correct and thank you for your prompt reply. So basically I’m up the creek with this. 

so what type or brand of primer would I use to go ahead with it wife decided to go with tiling?

[MitchellMc]

Hi @Phat,

I've just been chatting with the Dunlop technical team, and provided the paint has at least been scuffed up, you could thinly coat the wall with Dunlop 16kg Ready To Go Premix Render.

If you were to go the tiling route, you'd need to remove the rest of the paint entirely and coat the wall with Dunlop 4L Multipurpose Primer before applying your adhesive. However, if you were to remove the paint, you could then wet down the wall and apply render.

Mitchell

[Phat]

Thank you Mitchel, I would prefer to go the render route, so would I need to prime or just use this Dunlop ready mix straight on? Would I need to wet the wall prior to application? 

I’m so glad I came upon this thank you. Been beating my head in with this. 

[MitchellMc]

The Dunlop ready mix is full of polymers that stick well to just about everything @Phat. No need to wet the wall down.

Mitchell

[Phat]

Thank you, if I wanted a textured rough finish could I achieve this using this render? Would I use a roller to roll on? And if so is there a particular type of roller or brand? 

inappreciate your time thank you. 

[MitchellMc]

To achieve a textured finish, you could roll over the render with a textured roller once you've troweled it on @Phat. You could also apply the render smoothly and then go over it with a textured paint to achieve a stippled effect.

Mitchell

[Phat]

Morning Mitch, I really feel as though I should at least lay down some sort of primer on the wall before render, what do you think? Is there something that I could possibly a type that I can use to help the bond?