What primer to use on wall?

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

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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

https://www.workshop.bunnings.com.au/discussion/comment/56065#Comment_56065

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

https://www.workshop.bunnings.com.au/discussion/comment/90294#Comment_90294

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

https://www.workshop.bunnings.com.au/discussion/comment/111013#Comment_111013

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

https://www.workshop.bunnings.com.au/discussion/comment/122902#Comment_122902

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

https://www.workshop.bunnings.com.au/discussion/comment/130676#Comment_130676

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

https://www.workshop.bunnings.com.au/discussion/comment/135457#Comment_135457

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

https://www.workshop.bunnings.com.au/discussion/comment/138692#Comment_138692

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?

MitchellMc

https://www.workshop.bunnings.com.au/discussion/comment/140837#Comment_140837

Hi @Phat,

I enquired with the Dunlop technical team whether we should be using a primer, and they responded that it is not needed. Unlike a purely cement-based render, Dunlop 16kg Ready To Go Premix Render has polymer modifiers in it that allow it to bond to a variety of surfaces, including existing render and painted surfaces.

You might like to give them a call to discuss specifics on Ph: 1300 788 780. They can walk you through the process.

Mitchell

Phat

https://www.workshop.bunnings.com.au/discussion/comment/142421#Comment_142421

Ok thank you Mitch… much appreciated… 🙏

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