Ask a tradesperson
Painting & Decorating
Spider cracks over old patches of plaster?
Hello. We recently bought a 1960s house and started redecorating room #1. We've ended up with what I think are referred to as spider cracks, in multiple spots. I'm pretty sure it's not the paint that's the issue (see below). We're hoping someone help identify a remedy. Here's the info:
* The plaster wall had been patched in multiple spots by the previous owner(s).
* The cracks in the paint appear in multiple spots, but not everywhere (there are large areas of wall completely unaffected)
* I'm pretty sure the cracking is only happening over patches that were plastered by the previous owner, for various reasons: to the naked eye it definitely looks that way, we also tried matching up some pre-painting photos to the current problem areas and it looks to be a good match. I can also see that the same cracking has happened in other rooms in the house where paint has been applied directly on to the plaster walls.
* I re-plastered additional bits of the wall in room #1 myself, and the cracking doesn't appear to be happening over those patches.
These are thick walls, not drywall. The walls in this particular room were papered when we arrived, but underneath they were bare - no paint, just bits that had been plastered.
We stripped off the wallpaper, washed and scraped the walls, then sanded them with an electric sander to smooth them out and try to ensure we got as much of the wallpaper paste off as possible. I guess that would be enough to rule out paste residue as being the issue?
We applied 2 coats of primer/undercoat (http://bit.ly/11F60Db) and 1 coat of water based emulsion (http://bit.ly/1HOBgR6) but halted the work when we noticed the cracks.
Here is a picture of the cracking - although it looks to be affecting the most of the wall that's just the cropping of the image there are much larger areas unaffected http://bit.ly/1HOCmwj
2 Answers from MyBuilder Painters & Decorators
CJ Brown Decorating and Handyman Services
West Drayton • Member since 27 Oct 2014 • 4 jobs, 100% positive feedback
Good evening, regarding the spider cracks you have. these are fairly straight forward to repair as long as they are very small cracks if they are a decent size then you will need to use edge of scraper to open the cracks up to a V shape and then use a good quality filler and fill the cracks and when dry sand smooth. If they are small you simply need to sand over the cracks with a medium- or fine-grit sandpaper, feathering the edges. Then use a product called polycell base coat and paint on either over the whole wall or over the effected area feathering out and then once dried and cured ( follow recommended drying times on product) you can then apply 2 x coats of top coat emulsion. I know homebase sells the polycell base coat. I hope this helps you.
Answered 3rd Dec 2014
Nottinghamshire • Member since 14 Feb 2012 • 168 jobs, 100% positive feedback
The cracks are a good indication that before the plaster was applied the patch area was not dampened down with a pva glue, a way round it would be to size the walls and line with good quality lining paper, then apply a mist and 2 full coats..
Hope that helps..
Answered 3rd Dec 2014
How to avoid patches when painting over old oil based paint with bare plaster patches
We have removed old wood chip paper from two walls and there is what appears to be an old oil based paint underneath, there are...
Plaster over some remaining plaster - best way to achieve smooth walls?
Hi all, I would like to tap into your collective knowledge to find out if the current tradesmen in my house is doing the...
Painting older plaster with patches where paint won’t stick!
The house is 1960’s and we stripped wallpaper as we wanted to just paint walls. The condition of the walls is good (as a number...
Is my plasterer incompetent?
I’ve recently had my living room skimmed. As it’s an old house there were a couple of cracks in the original old plaster and...
Post your job to find high quality tradespeople and get free quotes
- All Questions
- Architectural Services
- Bathroom Fitting
- Carpentry & Joinery
- Carpet & Lino
- Central Heating
- Chimneys & Fireplaces
- Conversions - General
- Damp Proofing
- Demolition & Waste Clearance
- Fascias, Soffits & Guttering
- Gas Work
- Groundwork & Foundations
- Hard Flooring
- Kitchen Fitting
- Landscape Gardening
- Loft Conversions
- New Builds
- Painting & Decorating
- Restoration & Refurbishment
- Security Systems
- Tree Surgery