Repairing Damaged Walls

How to Repair Damaged Walls

(due to leaks or other problems)

Step by Step

Planning & Preparation

  • Lay out protective sheets to cover the floor and any nearby furniture
  • If the wall has become damaged by water infiltration, then make sure the source has been contained.
  • Before any repairs start the area needs to be dry. It is recommended for large areas for a dehumidifier to be used. Time for it to dry varies, depending case to case on the scale of infiltration.
  • Thorough preparation is key to achieving a good finish. Be sure to clean the area well and remove any loose parts, dust, grease or any surface contaminants like salt efflorescence. Remove any loose plaster or flaky paint.
  • If sanding plaster be sure wear to wear protective goggles and a dust mask.
  • When mixing or applying plaster, wear safety goggles, a dust mask and protective gloves.
  • Mold and algae growth must be treated with RASAN before RAPRIMER is used.
  • Always test RAPRIMER on a small area first to check compatibility issues.
  • Prime the area well using RAPRIMER on a max 1:3 dilution


After 12 hours curing, Premac 116 (Gipsos based plaster for interior) available from R.A & Sons Ltd) is to be used to repair the wall. When dry, the wall must be levelled.

Next, apply the RAFIN Plus (finatura) in a very thin layer. Mix the product until creamy and then allow it to stand for 5 minutes, remix thoroughly and then the plaster is ready to apply. Lightly wet the surface before application. RAFIN plus should be mixed with a paddle mixer in a clean bucket, using approx 8-9 litres of clean water per 25kg bag.

Primers and Paints

  • Next day prime the area well with RAPRIMER 1:3 dilution and when dry apply the final indoor paint in two coats.

R.A & Sons Manufacturing produces a whole range of interior paints:

Please feel free to ask for the colour chart.

Please feel free to contact RA & Sons for further information and help.


Whilst every effort has been taken to confirm the accuracy of the information presented in this article, R.A. & Sons Ltd and R.A. & Sons Manufacturing Ltd cannot be held responsible for errors and / or omissions or for any direct or indirect consequences resulting from the use and application of its products.

The company expressly disclaims any and all liability as to any results obtained or arising from any use of its products or reliance on such information; no warranty of fitness for any particular purpose or any other warranty, expressed or implied, is made concerning the goods described or the information provided herein.

If you have any questions please contact us here.

© Copyright RA & Sons Ltd 2024