Title: Mix primer, primer-surfacer, and primer-sealer.
Course: Collision Repair Technology II (20117-II) > Section: Preparing the Surface

Mixing of undercoats should include

- identifying types of preparation coats
- selecting preparation coat based on substrate
- determining ratios and proportions
- following all product manufacturer guidelines and recommendations.

Process/Skill Questions:

- What are the differences between primer-surfacer and primer-sealer?
- Why is primer used?
- What safety precautions should be taken?
- Why is it important to apply primer per manufacturer guidelines?