Q.34 Arrange the following steps for painting of surfaces in a sequential manner. 1.First coat 2.Final coat 3.Prime coat 4.Surface preparation
- A4, 1, 3, 2
- B4, 3, 1, 2Correct
- C3, 2, 1, 4
- D3, 1, 2, 4
Solution
Concept
Painting order: prepare surface, apply primer, apply undercoat (first coat), then apply final coat.
Step-by-step solution
1. First, clean and prepare the surface (step 4). 2. Apply the prime coat to fill pores and give a base (step 3). 3. Apply the first coat (undercoat) (step 1). 4. Apply the final finishing coat (step 2). 5. So the order is 4, 3, 1, 2.
Explanation
Paint sticks well only on a clean, dry and smooth surface, so surface preparation comes first. The primer is applied next to seal the surface and help bonding. After that come the first coat and then the final coat.
Why the other options are wrong
A: The prime coat must come before the first coat. C and D: Surface preparation cannot be the last step. It is always done first.
Shortcut
Remember P-P-F-F: Prepare, Prime, First, Final.
Common mistake
Thinking 'first coat' means the primer. The primer is a separate base coat applied before the first coat.
Correct answer: B) 4, 3, 1, 2