Technician A says after washing and dewaxing, the first step in preparing a steel surface for application of undercoats is to sand the surface with a dual action sander (DA). Technician B says that the first step in preparing any surface for application of undercoats is to soap and water wash. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question

Quizplus · Accepted Answer

Technician A is correct that sanding the surface with a dual action sander (DA) is the first step after washing and dewaxing to prepare a steel surface for application of undercoats. This is because sanding roughens the surface, which helps the undercoat adhere better. 
Technician B is also correct that washing the surface with soap and water is an important step in preparing any surface for application of undercoats. This is because it removes any dirt, grease, or contaminants that could affect the adhesion of the undercoat.

Technician a Says After Washing and Dewaxing, the First Step