ACRP Workbook Chapter 29: Surface Preparation

When refinishing a collision repair, the appearance of the topcoat depends on the thoroughness of ___ preparation.

Surface

___ is the ability of two substances to bind together.

Adhesion

When one substance bonds to another through an interaction between atoms or molecules its called ___.

Chemical adhesion

In ___, the roughness of a surface allows a liquid topcoat to flow into tiny grooves and scratches and "grip" onto the surface.

Mechanical adhesion

True or false: When preparing surfaces for refinishing, always choose the most aggressive method that will do the job.

False

The standards for surface preparation can be divided into ___ categories or levels.

Three

True or false: Level 1 surface preparation requires the most amount of labor compared to the other levels.

False

During Level 1 Preparation, explain what is meant by clearcoat melting.

A melt is a tapered blend in clearcoat. The clearcoat is sprayed on a thin, tapered edge of a panel adjacent to the one painted to hide the edge of the new clearcoat and disguise the repair

The goal of level 3 surface preparation is to make a(n) ___ repair.

A. Noticeable

B. Cheap

C. Undetectable

D. Expensive

C. Undetectable

Which of the following steps is the first procedure in basic vehicle surface preparation?

A. Plan the repair

B. Inspect the surface carefully

C. Paint the area

D. Sand the area

B. Inspect the surface carefully

True or false: One mil is 0.1"

False

Match the description to the vehicle paint problem

A. Appears as reddish brown grains on bare steel

B. Gradual change in color due to paint pigment breakdown

C. Weather-beaten paint with no gloss due to paint binder breakdown

D. Creates a weak, flakey area with bubble-like paint blisters on the surface

E. Caused by loss of adhesion between the topcoat and primer

F, Begins as tiny slits in the paint surface often caused by UV exposure

A. Surface rust

B. Fading

C. Chalking

D. Internal rust

E. Peeling

F. Cracking

Explain the difference between painted, blended, and melted in reference to how a vehicle panel will be refinished with basecoat and clearcoat.

-Painted: The entire panel will be sprayed with basecoat and clearcoat

-Blended: The panel will be partially sprayed with basecoat and fully sprayed with clearcoat

-Melted: The panel will be partially sprayed with basecoat and clearcoat

True or false: Repairs of external vehicle panel surfaces may damage internal surfaces.

True

A separate vehicle panel makes a good edge to end ___ so a repair is unnoticeable.

A. Refinishing

B. Welding

C. Bending

D. Pulling

A. Refinishing