How to Paint a Room

Posted on June 24, 2014 by rtco-admin No Comments

Painting a room is a great way to spruce up your home. 
Make sure to use Low VOC products to make sure 
your air quality stays clean along with your newly painted walls.

Time: 2-5 Days

Cost: $150 for a 10’x10’ room

Skill Level: Easy

Supply List:

Large Sponge                          Paint With Primer

Bucket                                         120-Grit Sandpaper

Paint Roller Frame             Sanding Sponges

Paint Pan                                   Latex Painter’s Caulk

Paint Roller Extension    Patching Compound

Caulking Gun                         Primer

Paint Brushes 2”-2-1/2”   Painter’s Tape

Putty Knife                               Tray Liners

5 in 1 Painter’s Tool            Roller Covers

Utility Knife                             Plastic Cups

Window Scraper                   Plastic Sheeting

Pole Sander                              Dust Mask

**Items in bold can be borrowed from our Tool Library

Buying Paint
A gallon of paint covers about 400 Square Feet (SF).
 To figure out how much you need, add up the 
lengths of all the walls, and then multiply the 
sum by the height. Subtract 20 SF for each door
 and 15 SF for each window. Divide by 400.

Example: 10’ x 12’ bedroom with 9’ high ceiling,
 1 window and 1 door
•       10’+10’+12’+12’= 44’
•        44’x 9’=396 SF
•        396 SF – 20 SF – 15 SF = 361 SF
•        361 SF buy 400 SF = 1 gal per coat

1 Prepare the Room – Remove all art from walls, move furniture out away from 
the walls, and cover with plastic sheeting or a tarp. Cover the 
floors in plastic. Remove all switch and outlet plates or cover
 with painters tape.

Try re-using your newspaper to protect the floors.

paint 1


2 Patch, Fill and Sand – Use a putty knife to patch any holes, gashes, or dents 
with patching compound and allow to dry. Sand any rough 
areas with sand paper or sanding block (2a). Check around 
windows and exterior doors for gaps in caulking (2b). Remove 
and repair caulking if necessary. Tape window and door
trim, baseboards, and vents, switches, and outlets with painters
tape for a clean paint line.



paint 2



2a. Guide sander flat against the wall and 
change paper grit if worn or clogged.



paint 3



2b. Wet finger and smooth the caulk with even
pressure to push it into the crack and leave a crisp edge.



3 Clean
 – Vacuum dust from the walls, ceiling, and plastic. Wipe 
down walls and ceiling with clear soap-free water. Never allow 
the sponge to have too much water.

4 Cut in- 
If your paint does not have primer already mixed in, you
 will need to start with priming the walls. This will help the
 paint’s coverage. Pour a small amount of primer/paint into a
plastic cup. Use a 2 1/2” synthetic brush to cut in (4a). Carefully brush 
a 2” to 3” band around the whole room 

Areas to cut in:

All Corners

Against the Ceiling

Next to Molding

Around Door and Window Frames

paint 4


4a. Make sure to fill the bucket with warm
water and have a rag ready to clean up any messes.




paint 5






paint 6


5 Load the Roller
 – Place a tray liner in the paint pan. Pour the primer/paint 
into the tray up to the grated area in of the tray. Roll the roller 
in the paint back and forth over to grate to load the roller and 
remove any excess.



paint 7



6 Cover the Walls
 – With a loaded roller, roll the primer/paint in a “W” or a
“M” shape across the walls. Make sure to go slightly over the
 brushed edges to blend any brush marks.



7 Let Walls Dry
 –  With primer a thick coverage is not needed. With paint
 you may need a second coat. Allow the primer to dry to the 
touch before applying paint. Allow time to dry between all 


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