Observation

Candidates that attempted the question did very well. The candidates were expected to provide the following answers in order to score good marks:
           

•      -            It is the first coat of paint applied to a new surface to prevent decay of 

      wood  and corrosion of metal.  

•       The basis or foundation of the entire paint system upon which the

 stability of the success of the whole system depends.  

•       A first coat on new metal or wood or on an old surface from which all

old paint film has been removed.

•       The first coat of paint to be applied to any surface.                                                    

                                                                 
            (b)        -           Red lead primer;
-           calcium plumbate;
-           micaceous iron oxide;

•       zinc chromate;
•       zinc phosphate;
•       zinc rich primers etc.

                 
(c)        -           Clean thoroughly to remove dirt’s;
-           sand or grit blast to loose rust and mill scale;
-           scrape/remove the loose rust and millscale;
-           wire brush the surface to remove corrosive substance;
-           clean the surface and allow solvent to dry off;

•       apply primer after cleaning.