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Old 05-20-2010, 07:35 AM
 
Location: Johns Creek, GA
17,447 posts, read 65,806,676 times
Reputation: 23573

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Quote:
Originally Posted by richb View Post
Streaking in semi-gloss and gloss paint in new construction (or new drywall) is a common problem.

It's not a "common" problem- it's a problem when the paint contractor hires inexperienced labor.

The reason why?

The surface of new walls made of drywall are basically composed of TWO materials. The drywall sheets are one, the joint compound in the taped areas are the second. They absorb paint differently resulting in the streaking. Notice that the taped areas of the wall can be far smoother then the areas that are just drywall.

Not the "reason" at all. These things you mention are true- but don't create "streaky finishes". That's more the "checkerboard effect". This is why we prime walls first, and sand the entire wall before paint- for a uniform and smooth finish.

Flat paint is far more forgiving so you really don't see the streaking (its still there). That's why the majority of builders don't paint with semi or gloss paints. Or they charge far more for semi or gloss paint (if they are going to do it correctly).

The upgrade charge that painters charge is because of the extra paint- they usually do two heavy coats and if there are any d/wall repairs that have to be made you can't "touch-up" just the patch. You have to paint the entire wall corner-to-corner.

I had a buyer that wanted gloss paint in his new home. The builder told him a upgrade price of $2500 (it was about a 1600 sq. ft house). He questions why it costs so much extra (since gloss paint basically cost the same as flat) . They tell him that if they just paint the new drywall it will be streaky and wavy. They solve the problem by skim coating the drywall (basically a veneer plaster). So I give that builder credit for being honest about it and educating my buyer about it. I guess your builder wasn't.

Riiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiight (sarcastically, very sarcastically).

The only way to have glossy paint is to either do that or wait until there are several coats of paint on those walls. At that point you are painting paint (whatever that means) rather then drywall. A new house may only have two coats on it (the primer and the top coat). Most builders won't see any pay back on painting more. Most buyer won't know the difference between two coats or three or more. So they don't.
The main reason for "streaky walls"(streak lines that run in sections or from floor to ceiling on occasions) is from not keeping a wet edge. You have to keep a wet edge on everything- cut-in as you go instead of the usual cut everything in first, then roll. Generally, painters will use thick nap rollers to help keep a wet edge. A wet edge is the edge of the paint line as you roll the paint on. If this edge is allowed to "flash over" before coming back with the roller to blend it in- you create the "streaking".
The general rule-of-thumb for satins and eggshell finishes is to cut-in a small section, then load the roller heavy, go ceiling to floor, smooth, reload, apply, smooth, reload, etc. And continue the cutting-in as you go- keeping the wet edge.
OP- a repaint would be in order. Maybe you can educate the painter with this new found knowledge.

Last edited by K'ledgeBldr; 05-20-2010 at 07:54 AM..
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Old 05-20-2010, 07:47 AM
 
1,474 posts, read 4,986,652 times
Reputation: 557
Quote:
Originally Posted by K'ledgeBldr View Post
The main reason for "streaky walls"(streak lines that run in sections or from floor to ceiling on occasions is from not keeping a wet edge. You have to keep a wet edge on everything- cut-in as you go instead of the usual cut everything in first, then roll. Generally, painters will use thick nap rollers to help keep a wet edge. A wet edge is the edge of the paint line as you roll the paint on. If this edge is allowed to "flash over" before coming back with the roller to blend it in- you create the "streaking".
The general rule-of-thumb for satins and eggshell finishes is to cut-in a small section, then load the roller heavy, go ceiling to floor, smooth, reload, apply, smooth, reload, etc. And continue the cutting-in as you go- keeping the wet edge.
this makes a whole lot of sense. I've seen this in areas where I got lazy to reload my roller with paint and tried to squeeze paint for 'more coverage'. also happens when I passed the roller on areas thats 'almost dry'
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Old 05-20-2010, 10:41 AM
 
Location: Johns Creek, GA
17,447 posts, read 65,806,676 times
Reputation: 23573
Quote:
Originally Posted by SteveArmy View Post
this makes a whole lot of sense. I've seen this in areas where I got lazy to reload my roller with paint and tried to squeeze paint for 'more coverage'. also happens when I passed the roller on areas thats 'almost dry'

Yep! That's your bogie.
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Old 05-20-2010, 11:08 AM
 
206 posts, read 745,848 times
Reputation: 112
Thanks for all the replies. They are going to do a repaint. Hoping they get it right this time. Interesting to know why it happens. Appreciate all of the responses and input.
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