1. Selecting and Applying Painting Materials
Unit 29
Selecting and Applying Painting Materials

2. Paint What is the purpose of Paint? There are two types of paint:
To improve:
Appearance
To preserve
There are two types of paint:
Oil-based
Water-based (latex)

3. Paint What are the two types of paint finishes? Types of Finishes
Enamel (shinny)
Flat finish (dull)
What is the correct temperature for painting?
The correct temperature for painting is:
75 – 95 degrees Fahrenheit

4. Application Methods Brushes and Rollers Low cost
Used for most home and farm projects
Brushes are useful for small paint jobs and painting irregular areas
Rollers are the best method for making, wide, flat and quick applications.

5. Spray Guns Application Methods
Device that releases paint in the form of a fine spray
Two types:
air atomization: paint is split into tiny droplets using compressed air (pneumatic)
airless: paint is pumped through hoses under high pressure; no air is used

6. Spray Guns (continued)
Major parts
gun body
fluid control knob
pattern control knob
air valve
paint needle valve
packing nuts
fluid nozzle
air nozzle
trigger

7. Aerosol Can’s Application Methods
Pressurized paint in a disposable can.
Cheap
Easy to use
Little clean-up

8. Preparing Wood and Metal for Painting
Methods used to prepare wood and metal for painting are:
Sandblasting
Pressure Washer
Wire Brush
Sanding
Chemical Solvents

9. Spray Painting Procedure
Prepare the surface
Choose an appropriate location
Follow safety precautions
Prepare the paint
Adjust the spray gun
Operate the spray gun
Clean equipment

10. Safety Rules Mix paints and solvents in well-ventilated areas
Spray paint outdoors or in special booths
Never smoke or have any source of fire in the vicinity
Wear a respirator or paint mask
Only use ladders that are in good condition
Avoid electrocution! Keep aluminum ladders away from all electrical wires

11. Safety Rules Mix paints and solvents in well-ventilated areas
Spray paint outdoors or in special booths
Never smoke or have any source of fire in the vicinity
Wear a respirator or paint mask
Only use ladders that are in good condition
Avoid electrocution! Keep aluminum ladders away from all electrical wires

12. Operating a Spray Gun
A gun stroke is made by moving the gun parallel to the work
The closer the gun is to the work, the faster it must be moved to avoid sags and runs
The farther the gun is away from the work, the drier the paint spray and the more spray dust is created

13. Important Terms Formulate: to put together according to a formula
Chalking: formulated so that a tiny bit of the film washes off each time it rains
Trim and shutter paint: formulated to stay bright without chalking
Enamel: paint with a gloss or semigloss finish
Gloss: shiny
Semigloss: slight shine

14. Important Terms (continued)
Flat finish: dull or without shine
Water-base: contains a water vehicle
Oil-base: contains an oil vehicle
Latex: water-based paint
Alkyd: oil-based paint
Epoxy: synthetic material with special adhesive and wear-resistant qualities
Interior: does not hold up to weather
Exterior: withstands weather conditions

15. Important Terms (continued)
Hiding power: ability to a create color and mask the presence of old colors
Lead: metal that has a cumulative toxic effect and stays in the body once ingested
Titanium dioxide: high-quality pigment
Calcium, magnesium, silicon: low-quality pigments
Asphalt: provides excellent black hiding power
Undercoater: used to prepare surfaces for high-quality top coats

16. Important Terms (continued)
Compatible: go together without undesirable reactions
Drop cloth: material used to protect surroundings from paint droppings
Fingering: dividing of bristles
Loading the brush: removing excess paint to prevent dripping
Paint roller: cylinder that turns on a handle
Nap: the soft, woolly, threadlike surface of the roller cover

17. Important Terms (continued)
Propellant: propels paint toward object being painted
Regulator: keeps air pressure at a set level
Extractor: removes moisture and oil from the compressed air
Siphon system: has a small vent hole in the cap of the cup
Pressure feed cup and pressure feed tank systems: operate with the paint under air pressure at all times

18. Important Terms (continued)
Aerosol: high-pressure container with a valve and spray nozzle
CFM: cubic feet per minute
Viscosimeter: instrument used to measure the rate of flow of a liquid
Viscosity: a liquid’s tendency to flow
Roller cover: hollow, fabric-covered cylinder that slides onto the roller handle

19. Important Terms (continued)
Sag: when a large area of paint shifts downward because it has been applied too thick
Run: narrow stream of paint flowing downward due to excessive buildup
Tacky: sticky