Hi there, could you please guide me how to fix this imperfection cement walls and doors, things I need to buy? Thanks
Hi @buildadreamhouse,
Welcome to the Bunnings Workshop community, it is fantastic to have you with us.
Just to clarify, the first two images appear to be rendered concrete walls, whereas the third image seems to be a timber door jamb. Would that be correct?
I ask because the approach would be slightly different depending on the base material you are fixing.
For the first two images, which appear to be rendered concrete, you would start by tidying things up and removing any obvious high spots using a paint scraper such as this https://www.bunnings.com.au/100mm-sharp-edge-paint-scraper_p1670156 . There doesn't look to be much to tidy up, but this specific piece is what I am referring to.
Once any high spots have been removed you would apply a skim coat of https://www.bunnings.com.au/dunlop-20kg-fine-coat-render_p0760244 to smooth things out. The first image is relatively simple because you would just apply it over the whole width of the wall as it is narrow, but the second image will be a bit trickier because you need to feather it into the rest of the wall. The main issue with the second image is they didn't really go wide enough with their application to give them space to feather it out. Realistically, to feather out the application, you'd need to go around 100mm or so past the light switch and try your best to give it a really consistent slope towards the point where the new render stops.
To do this, you'll want to use a wide application tool. Renderers will typically use a trowel such as this https://www.bunnings.com.au/trojan-330-x-115mm-finishing-trowel_p0551207 to apply and smooth the render initially, then follow up with a float to get it perfect.
The circumstance is different, but the steps shown in https://www.bunnings.com.au/diy-advice/home-improvement/walls/how-to-apply-a-top-coat-to-render are much the same as what you'd be doing.
Once finished, and dried, you can prime and paint to match the surrounding walls.
The door frame in image 3 is much easier to deal with. You can apply a skim coat of plaster topping compound, such as this https://www.bunnings.com.au/gyprock-csr-2-25kg-less-mess-topping-compound_p0173348 , using the paint scraper mentioned for scraping the high spots. Make sure to give it a good mix before applying to make it light and fluffy and do your best to apply it nice and smooth. Once dry, give it a good sand with a sanding sponge to get it nice and smooth, brush away any dust and then prime and paint.
With all of these steps, it would be worthwhile to put down a drop sheet to protect your floors and wear appropriate protective equipment such as safety glasses and a mask as there may be some airborne sanding dust that you'll want to avoid getting in your eyes or breathing in.
It might be worth starting with the door frame and seeing how you feel, as plaster is much easier to work with than render. If you do a great job and are happy, move on to the render, but if you are a bit concerned, you might want to reach out to a renderer for their assistance.
There's a bit to it, so please don't hesitate to reach out if you require further clarification about anything.
Jacob
