How to fill large holes in internal white set walls?

[SueMacca]

I’m repainting the internal house and want to fix the large cracks that appear in every room. I have removed the loose white set and render so it back to the brick. 
1. What is the best product to fill the holes 

2. does the hole need to be sealed with a primer before filling to help the filling compound stick. If so water based or oil based primer 

thanks 

 

[EricL]

Hello @SueMacca 

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

Since your render doesn’t have a gritty texture, Dunlop 5kg Ardit Rapidset Repair Mortar would be a great option for achieving a smooth and durable finish. This product is designed for fast repairs and easy application. Because the damage is not very large there is no need to use a primer for the surface, just make sure that it is clean and free of debris before applying the patch.

To apply it, use a trowel to spread the mortar evenly over the surface, ensuring full coverage. Work quickly, as the product sets rapidly. Once applied, immediately smooth it off to achieve a level finish. After about 15 minutes, go over the surface with a wet trowel to refine the texture further. Using a damp sponge at this stage will help eliminate any trowel marks and create a uniform, polished look.

For best results, refer to the application guide to ensure proper mixing and working times.

Once the patch has fully cured, I suggest using a paint primer over the surface before putting your topcoat on.

If you need further assistance, please let us know.

Eric

[SueMacca]

Thanks Eric.  What would I use as a top coat

[EricL]

Hello @SueMacca 

I recommend doing a quick paint test on your wall to see if it is oil or water based. Get a clean rag and some methylated spirits, apply some metho at the end of your clean rag and rub a small out of the way section of your wall where it is not in direct view. If the paint comes off, it is water based, but if the wall only becomes clean and shiny it is oil based. Once you find out what kind of paint you have you can then properly choose your topcoat. I recommend choosing from either Dulux Wash & Wear or Taubmans Easy Coat.

If you need further assistance, please let us know.

Eric

[SueMacca]

Thank you 

I know it’s water based.  
Appreciate your help