How to Paint Stucco Wall with New Exterior Paint

Fig.1 Small paint roller cover

By Gary Boutin

Supplies and Tools: 
Exterior paint with UV additives
Paint roller frame 9 inch
Paint roller tray (disposable)
Paint roller cover 9 inch

Recently my wife noticed some blank spaces near our front door. The idea was just to coat the areas missing paint. What happened instead was that the new paint was much brighter than the old paint which was had been sprayed. A paint roller was used to cover the blank areas.  

This post shows the five steps showing how ultraviolet light (UV) light was changed from just two year when the wall was spray painted. 

Step 1: Fig.1 shows the roller cover used to paint this wall.
Step 2: Fig.2 shows the application of new paint on the stucco wall. 

Fig.2 Painting wall

Step 3 Fig.3 shows that the sun attacks these emulsifiers, the paint starts to fall apart. Pigments within the paint shows signs of wear due to the sunshine and these are the elements control the color of the exterior walls.

Fig.3 More missed spots repainted

Step 4: Fig.4 shows that Ultraviolet Radiation (UV radiation or ultraviolet rays) is a form of energy in form of heat, radio waves and microwaves. The sun rays attacks the emulsifiers within the paint. Notice how the back color is a lighter shade than the new rolled on paint.

ead more : http://www.ehow.com/how-does_5267263_light-affect-color-paint.html

Fig.4 Paint spots

Step 5: Fig.5 show the paint has dried and the wall is a different color than the back wall. You can see an outline of he new paint being surrounded by the faded paint. The only way to fix this is to paint the entire wall the same color. Presently their is no way to block UV rays permanently, some paints have additive that help against UV light. Metamerism is the change from the walls were visible light and UV show different wavelengths on a wall. Meaning that what the color on the paint chip is not the color you expected on the freshly painted wall.

Fig.5 More paint spots

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