Which of the given procedures should be followed before applying paint onto different components of a building?

i) Chalking

ii) Flaking

iii) Removing blisters

iv) Surface wetting 

Before applying paint onto different components of a building, it's essential to prepare the surfaces properly to ensure good adhesion, durability, and a smooth finish. Let's analyze each of the given procedures to determine their relevance:

1. Chalking: 
   - Chalking refers to the formation of a powdery residue on the surface of the paint film, often due to the weathering of the paint. This residue needs to be cleaned off before repainting to ensure proper adhesion. However, "chalking" itself is not a procedure; rather, it's a condition that may need addressing.
   - Not a procedure to follow before painting but something to address if present.

2. Flaking: 
   - Flaking refers to the peeling or scaling off of the paint layer. Before applying new paint, any loose or flaking paint should be scraped and removed to ensure the new paint adheres properly.
   - Correct procedure to follow before painting.

3. Removing blisters: 
   - Blisters are raised areas of paint caused by moisture or poor adhesion. These should be removed, and the surface should be properly prepared to prevent the problem from recurring.
   - Correct procedure to follow before painting.

4. Surface wetting: 
   - Surface wetting is usually not recommended before applying paint, as it can cause poor adhesion and other issues. The surface should typically be dry and clean before painting.
   - Not a standard procedure to follow before painting.