Task difficulty: Very easy

Step by step process

1. 

   Step 1

   Ensure the surface and gap is dry and free from loose material.

2. 

   Step 2

   Using a filling knife, apply the filler directly into the gap - then smooth off with a wet knife. For holes or gaps over 20mm deep, build up in layers and allow to dry in between.

3. 

   Step 3

   Once dry, sand with fine sandpaper for a perfect finish ready for painting.

4. 

   Step 4

   Can be overpainted with care once surface is dry. After use replace lid, wash tools in warm water.