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Patch a Crack Over a Strie – A How To

It can be a real challenge to patch a crack over a strie or other glazed surface.  GIDP revisited a job that was completed about 5 years ago, the wood paneling had cracked on many of the joins of our painted finish.   It is always important to assess whether it would be easier to touch up the cracks with acrylic or just re-paint and re-glaze the entire area.  Sometimes it is just as fast to redo the area instead of touching up.  However, in this case, Pierre decided to touch-up instead in the interest of time.  Pierre Finkelstein of Grand Illusion Decorative Painting shows you how he created this finish. See also: Surgically Patch a Hole – A How To, Polished Plaster Surgical Touch Up – A How To

HOW TO CREATE THIS FINISH

Use our step-by-step instruction below

MATERIALS NEEDED:

Here is a list of the tools & supplies you will need to achieve this technique.  Supplies available at fauxbrushes.com are linked below and listed at the bottom of the page.

1

PROPER PREPARATION

STEP 1 – PROPER PREPARATION:  First step the your preparation is digging out the cracks.  This is an important step even though it may seem it’s making the problem worse. The best way to perform a small touch-up, is to keep it small.  

2

TAPE OFF

STEP 2 – TAPE OFF:  Normally, Pierre would use painter’s tape to mask the area before filling the crack, but the tape was pulling off the glaze, so this time we did without. 

3

FILL-IN CRACKS

STEP 3 – FILL-IN CRACKS:  Plaster of paris was used to fill the hole because it dries fast and doesn’t shrink.  Then it was filled-in again with a harder plaster putty.  Using a conservative hand, sand with soft Sandpaper pad (320 grit), softly and with gradual pressure. The finish should be smooth. The final coat was sanded down and wipe any excess off with a wet rag.

4

APPLY PRIMER

STEP 4 – APPLY PRIMER: A tinted acrylic Primer was then mixed.  The exact color was not the focus, but the value of the final color was the goal.   

Uh oh, a jobsite mistake!   Look for a big difference in the patch on the left and right.  The left side was painted way outside the perimeter of the patch and thus caused much more work on the paint touch-up.   The error was caught early, thankfully.

5

MIX AND APPLY BASECOAT

STEP 5 – MIX AND APPLY BASECOAT: Fluid Acrylic Colors are used to tint to a color that best matches the middle value of the plaster.  Using the varnish as a painting medium, mix with the colors.  A few important things to remember about mixing colors:  Acrylic paint will dry darker, so have a hairdryer ready to test dry paint.  Always, mix enough for the entire job.

Paint the color as surgically as possible over the patch.  Pierre likes to use a sable-mix Pointed Detail Brush.

With a hairdryer to check your first patch.  It most certainly may need 2 coats.

6

APPLY PAINT TO RESEMBLE GLAZE

STEP 6 – APPLY PAINT TO RESEMBLE GLAZE: In order to make an acrylic touch-up look like a glaze, GIDP set out a palette of vibrant Acrylic Colors and a cup of water. 

Using the previously mixed Basecoat, Pierre made thin, parallel lines with a slightly darker color than the basecoat Repeating the process with a slightly lighter color, continuing to paint back and forth until a strie is formed.  

Lastly, a vibrant tonality was mixed using a yellow / orange and then applied to the surface.  When mixing, be wary of using titanium white as it tends to look cool like a grey value.  Great brushes to used for this technique are a long, pointed sable haired Liner Brush, or a samina haired Veining Brush.

7

FINISH AND PROTECT

STEP 7 – FINISH AND PROTECT:  As mentioned, Varnish was mixed directly into the paint. If you’re looking straight at the patch, it should look good.  Make sure you see it from an angle, but if the touch up looks off, it may need another coat of clear varnish.

COMPLETED FINISH

The patch wasn’t perfect, they never are. But it’s much better than how it started. See also: Surgically Patch a Hole – A How To, Polished Plaster Surgical Touch Up – A How To

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