My paint has ACNE. Help please.

[JCLP]

Hi Everyone. I am having what looks like acne/grit appear on a fresh coat of sprayed paint. The paint I'm using is BJ advance and is diluted by 10%. The grit does not cover the entire surface of the panel just small areas. Sometimes I can count the grit on 1 hand. I have sprayed many panels using the same technique and paint and have had 100% perfect coats. I do run the paint through 2 filters and it is stirred with a palette mixer for 2 minutes and diluted with warm water, not in that order of course. Sanded with 320 between coats. The gun is 100% clean. Any ideas?

 

[blaszcsj]

My first two guesses would be humidity changed or ambient dust.

 

[tjbnwi]

What equipment are you using?

What is the panel material?

Primed or not?

Tom

 

[JCLP]

My first two guesses would be humidity changed or ambient dust.

I thought about dust but I don't think so as some panels come out perfect and my paint room is not 100% dust free but close. As for humidity I'm between 70-75%.

What equipment are you using?

What is the panel material?

Primed or not?

Tom

The panels are primed and have 2-3 coats of paint already. Was trying to spray the final coat.

 

[tjbnwi]

Sounds like those areas were a little thicker and had not coalesced, the moisture caused them to pop.

Tom

 

[JCLP]

Sounds like those areas were a little thicker and had not coalesced, the moisture caused them to pop.

Tom

Hi Tom. These are not popping. The grit feels like grit from 400grit sander paper that landed on the pint. When it dries you cn pick it off with your finger nail.
I think my issue is caused by the paint particles drying before hitting the surface. I think I need to reduce the air flow and move closer, 3-4 inches from the surface, but not certain this would work..

 

[tjbnwi]

Seems strange that it is only in areas if dry fall is the problem.

I assume the previous coats are okay?

Can you increase material flow on the gun?

Tom

 

[mastercabman]

Sounds like dry spray
Try to spray a little closer
Maybe those could be your problems
Not enough material
Not over laping 50% spray pattern
Moving too fast in some spots
Spray fan not wide enough
Dirty nozzle
I used to have dry spray issues when using a turbine system but I was using solvent based paint
Hope you get it worked out

 

[JCLP]

Would anyone know what is causing this.
Using
Earlex 5500, 2 mil needle
Benjamin Moore Advance , diluted 10%
Gun 6-8" away from surface

 

[Shane Holland]

I had something similar happen many years ago with a dark red paint during a bathroom remodel. I had used a latex primer. After many frustrating attempts and getting results similar to what you're showing, albeit not as bad, I talked to someone who recommended using an oil-based primer. I did and it fixed the problem. Later on, I realized it was likely hairspray or some other containment on the wall that the latex primer didn't cover/protect against.

Not sure if that helps, but thought I'd share.

 

[JCLP]

I had something similar happen many years ago with a dark red paint during a bathroom remodel. I had used a latex primer. After many frustrating attempts and getting results similar to what you're showing, albeit not as bad, I talked to someone who recommended using an oil-based primer. I did and it fixed the problem. Later on, I realized it was likely hairspray or some other containment on the wall that the latex primer didn't cover/protect against.

Not sure if that helps, but thought I'd share.

Thanks Shane,
The panels already have 2 coats of primer and multiple coats of paint due to the many trials I have done. I just did another test by spraying one board with one pas and another with 2 passes and the second board looks better. I think this paint, and other thick Waterborne paints, need to be sprayed thick. Will do another test tomorrow morning and see what happens.
Cheers,

 

[Shane Holland]

I have the same sprayer. Just sprayed 29 cabinets doors and drawers using a high-end Sherwin Williams paint. I've sprayed lot of latex paints and various stains through it. I usually use the 1.5mm needle. I've tried the 2.0 and actually thought it was laying down too much material.

Your image looks like a pretty thick coat to me. I usually lay down 3-4 coats of paint when spraying to get to a final product.

It almost looks like air bubbles to me.

[member=13337]Scott Burt[/member] can probably shed some light on this for you.

 

[JCLP]

I have the same sprayer. Just sprayed 29 cabinets doors and drawers using a high-end Sherwin Williams paint. I've sprayed lot of latex paints and various stains through it. I usually use the 1.5mm needle. I've tried the 2.0 and actually thought it was laying down too much material.

Your image looks like a pretty thick coat to me. I usually lay down 3-4 coats of paint when spraying to get to a final product.

It almost looks like air bubbles to me.

[member=13337]Scott Burt[/member] can probably shed some light on this for you.

What Sherwin Williams paint do you use. I tried ProClassic today and got the same results. That photo is with a 1.5mil needle. This board has approx 5 coats on it. trying to get that final coat perfect.

 

[Scott B.]

That looks to me like turbulence from the Earlex gun, which (if you have the same one as me) is a bleeder style, meaning anytime you come off the trigger, it blows air. I think it looks like a combination of that and what looks like a fairly heavy coat. Still, I am surprised it wouldn't lay down because advance is a slow tacker upper.

I'd also recommend creating a bit more distance from the target than the 6-8" inches you mentioned, and stay on the trigger.

It is hard to tell in the picture you posted, but the downside of having to stay on the trigger like that is it creates quite a burst of overspray at your turnarounds. If these patterns are prevalent where you change direction then it could be overspray settling, but it does look like turbulence in the finish to me. If you come off the trigger when changing direction, the shot of air toward the floor could be kicking up dryfall, which I think Tom mentioned above.

Hope this helps.

 

[tjbnwi]

How is the temp and humidity where your spraying?

That picture looks like moisture blistering the surface.

What are you thinning with?

Tom

 

[Shane Holland]

What Sherwin Williams paint do you use. I tried ProClassic today and got the same results. That photo is with a 1.5mil needle. This board has approx 5 coats on it. trying to get that final coat perfect.

It's Sherwin Williams Industrial Pro Pre-Cat Semi-Gloss. I think they said it's a heavy duty epoxy latex.

I was going to go with the ProClassic but the guys there said they couldn't do the black/really dark gray because they didn't have the right base for that color in ProClassic.

I usually stay about 6-12 inches from the surface but also change the speed of my sweeps and regulate the trigger if I'm closer. I can't say my results are what Scott would be able to achieve with his equipment and experience, but definitely very acceptable in my opinion.

 

[mastercabman]

The picture you posted is not dry spray like I thought you described on your original post
It looks to me like air bubble  popping
You mentioned you put 5 coats,I think that's a little too much
What primer did you use?
If you use the wrong product it can cause lifting,popping,wrinkles,and other problems
Give us your finish schedule so that we can help you better

 

[JCLP]

That looks to me like turbulence from the Earlex gun, which (if you have the same one as me) is a bleeder style, meaning anytime you come off the trigger, it blows air. I think it looks like a combination of that and what looks like a fairly heavy coat. Still, I am surprised it wouldn't lay down because advance is a slow tacker upper.

I'd also recommend creating a bit more distance from the target than the 6-8" inches you mentioned, and stay on the trigger.

It is hard to tell in the picture you posted, but the downside of having to stay on the trigger like that is it creates quite a burst of overspray at your turnarounds. If these patterns are prevalent where you change direction then it could be overspray settling, but it does look like turbulence in the finish to me. If you come off the trigger when changing direction, the shot of air toward the floor could be kicking up dryfall, which I think Tom mentioned above.

Hope this helps.

Hi Scott, thank you for your input. The panels I'm painting are 6"x 24" drawer fronts and I spray from right to left and releasing the trigger when I pass the end of the panel and re-start when I'm approx 6" from the right so that the paint is flowing before I hit the panel. I have tried SW ProClassic, BJ Advance and Insulx Cabinet coat all with the same results. So it must be a delivery issue. I will try being about 12" from the surface with a 2mil needle and see what happens.
Cheers.

 

[JCLP]

I GIVE UP. I have been at this for over a month and tried every combination of needles, paint viscosity, distance from surface speed of travel and even different fan orientation.
My conclusion is the BJ Advance is not meant to be sprayed period. Eventhough Benjamin Moore says it can. Now to tell the client. Should be fun.
Thanks everyone who responded.
JC

 

[Jozsef Kozma]

You might be right about advance , my painters had issues with it
To a point , where they will not consider using it again
All other BM products are their choice of paint