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I have a wall in my bedroom that has had lots of little holes and dents filled in and not sanded back enough and then been painted over we dont wish to replaster as later on the wall will go for a renovation that will be some way down the track . Is there a product or topcoat that you would recommend going over the wall with to give a better finish when repainted any hints would be greatly appreciated
What type of wall is it? plasterboard? fibrous plastersheet? or lathen plaster?
In General here is what you would do.
First thing to do is get rid of as many "bumps" as you can. How, will depend on the substrate.
When the surface is painted it becomes a bit harder to scrape, I prefer scraping with a sharp blade where I can. Mainly because with sand paper tends to sand around the bump as much as taking off the bump itself. Where scraping will only take off the high points.
If you need to sand use a very coarse sand paper directly over the "bump" try not to sand around the "bump".
Then one (or 2 if needed) skim coat of Topcoat over the affected areas sand the top coat back with 150g sandpaper to a smooth finish. Don't worry about spreading the top coat wide. It sands easy.
Hope this helps
Rod Dyson
Thanks is there any particular brand of top coat that you would use? or are they much the same? I'm not sure if the plaster is plasterboard or lathen plaster the house is about 40yrs old and is an ex commission area
They all have slightly differnt charactoristics but they all end up doing the same job.
I personally prefer CSR Joint master, this is what we supply to most of our customers.
4o years ago would have been either plasterboard or fiborous plastersheet. Although around that time they were building commision houses with concrete pannels, so it may be render over this.
Either way go about the same way. It won't be lathen plaster.
Cheers
Rod Dyson
Using a window scraper with a sharp blade I find works well for taking away those initial bumps, also a sanding block will help prevent from sanding around the bumps. I would also recommend finishing up with a couple of coats of flat paint to hide imperfections.