'Initially, it seemed really simple and straightforward. We'd just fill the cracks with Polyfilla, leave it to dry, sand it down then paint over it. But then frustratingly, we'd see them come back ...

The proper method to repair these cracks in the plaster is not unlike finishing drywall seams. Some people recommend widening the crack and then filling it with compound.

If the crack becomes more than 1/4 inch wide, simply filling it with patching plaster may not be enough. In this case, use mesh drywall tape and quick-drying drywall mud to give the best chance of ...

What should I use to fill the cracks and then what should I use as a top coat on the interior walls? A: You can start by just troweling on elastomeric caulk into the cracks to fill them up.

Learn how to spot the difference between harmless and serious cracks in your walls. We asked an expert to explain when and why you should be concerned.

Learn how to spot the difference between harmless and serious cracks in your walls. We asked an expert to explain when and why you should be concerned.