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Bubbles in paint

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Forum topic by dakremer posted 05-16-2018 05:49 PM 250 views 0 times favorited 14 replies Add to Favorites Watch
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dakremer

2672 posts in 3086 days


05-16-2018 05:49 PM

Topic tags/keywords: paint finish

I have a Graco airless handheld sprayer. I sprayed some SW ProClassic and got (super) tiny little bubbles all over my would-be glass like finish. Super bummed. I was trying to problem solve the issue. I painted it outside in the shade – wasn’t super hot out, so I don’t think the paint dried too fast. I waited almost 24hrs to paint over the primer, so I don’t think that was the issue. The only thing I can think of, is that it’s old paint. It’s about 2.5 years old. When I opened the can and stirred it, everything seemed perfectly fine. Will old paint cause bubbles? Any other thoughts?

I can post a picture if you need me to.

-- Hey you dang woodchucks, quit chucking my wood!!!!


14 replies so far

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dakremer

2672 posts in 3086 days


#1 posted 05-16-2018 05:50 PM

I DID shake the can a little before opening it and stirring it…..did I just introduce too much air into the paint? I put it through a paint filter before into the spray gun.

I also should note, that I expect some bubbles when it is sprayed, but they usually pop before the paint dries, and then it self levels. These popped, but did not self level – wondering if the paint dried to fast for some reason?

-- Hey you dang woodchucks, quit chucking my wood!!!!

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John Smith

876 posts in 157 days


#2 posted 05-16-2018 06:03 PM

on the paint can label – does it say anything about spraying?
and how much to reduce for spray application?
what primer did you use?

I think it is not the age of the paint, but, the older a paint gets, the more
liquid is lost over time. so it may take a little more thinning agent than usual.
the faster a paint dries, the slower the recovery it has around bubbles and brush marks.
so when spraying, if your ambient conditions permit, you need to slow down
the evaporation accordingly so that brush marks and popped bubbles can heal themselves.
a paint additive is used by most commercial painters just for this purpose.
I looked at the 24 reviews for that particular paint and a lot of the feedback was saying that
that particular paint is not for the novice painter due to its tendency to sag on vertical surfaces.
and thinning or modifying it only exasperates the negative issues.
I often shake cans of paint and varnish vigorously – nothing wrong with that.

try it again with a little more thinner just for a sample. if you intend to do more painting
with latex paint, pick up a small bottle of Floetrol. especially in the hot summer months.

.

-- Graduated Valedictorian from the University of HardKnocks --

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dakremer

2672 posts in 3086 days


#3 posted 05-16-2018 06:05 PM



on the paint can label – does it say anything about spraying?
and how much to reduce for spray application?

- John Smith

I will look. I’ve sprayed ProClassic (without reducing) before with no issues.

-- Hey you dang woodchucks, quit chucking my wood!!!!

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jbay

2276 posts in 894 days


#4 posted 05-16-2018 06:44 PM

Paint is too thick or sprayed too heavy, or both.
It’s hard to reduce material with an airless so I would thin it more. Try not to spray it as heavy.
Sounds like the paint is making indentations that look like bubbles, got pics? Probably not true bubbles per say.

I’m personally not a fan of floetrol, some people like it though, just not me.

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dakremer

2672 posts in 3086 days


#5 posted 05-16-2018 07:11 PM



Paint is too thick or sprayed too heavy, or both.
It s hard to reduce material with an airless so I would thin it more. Try not to spray it as heavy.
Sounds like the paint is making indentations that look like bubbles, got pics? Probably not true bubbles per say.

I m personally not a fan of floetrol, some people like it though, just not me.

- bay

I will get you some pictures. I did not thin the paint at all. I sprayed a very light coat. I’m thinking maybe I didn’t have my setting high enough on my sprayer.

-- Hey you dang woodchucks, quit chucking my wood!!!!

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dhazelton

2766 posts in 2291 days


#6 posted 05-16-2018 07:17 PM

I picked up a Wagner Flexio that was super discounted. I watched online vids and the finish always looks pretty matte and spattery, like it’s pushing too much air. I think if you want a smooth or glossy finish this type of sprayer may not be the answer.

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dakremer

2672 posts in 3086 days


#7 posted 05-16-2018 07:38 PM



I picked up a Wagner Flexio that was super discounted. I watched online vids and the finish always looks pretty matte and spattery, like it s pushing too much air. I think if you want a smooth or glossy finish this type of sprayer may not be the answer.

- dhazelton

I’ve used a Wagner Flexio. They are garbage. This sprayer is 1000x better. My finish with this gun is extremely nice. I’ve never gotten bubbles like I did today.

-- Hey you dang woodchucks, quit chucking my wood!!!!

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PPK

1000 posts in 804 days


#8 posted 05-16-2018 07:40 PM

Boy, the only time I’ve had bubble problems is if there was too much heat, and the finish was drying too fast. That’d be my first guess at the culprit.

-- Pete

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dakremer

2672 posts in 3086 days


#9 posted 05-16-2018 07:58 PM

Here are some pictures of the bubbles. They are very tiny. I put a key next to it so you can see the scale…

-- Hey you dang woodchucks, quit chucking my wood!!!!

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dakremer

2672 posts in 3086 days


#10 posted 05-16-2018 07:59 PM

They look like bubbles that popped, but then didn’t level out. You can see the hole from the escaped air…

-- Hey you dang woodchucks, quit chucking my wood!!!!

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pintodeluxe

5654 posts in 2808 days


#11 posted 05-16-2018 08:11 PM

That’s too bad. I usually see bubbles when I spray paint, but like you said they usually disappear by the time it dries. My usual solution to spraying woes is to scuff sand, thin the product slightly, and spray another coat.

Good luck.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

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Rich

2809 posts in 584 days


#12 posted 05-16-2018 11:24 PM

I’ve switched to Sherwin Williams pigmented wood finishes, available in water based or solvent. I got so tired of dealing with latex. I’m with jbay re: floetrol too. It might be OK for painting walls or something, but if you want a flawless surface on your wood project, it’s just too frustrating for me to mess with.

-- No matter how much you push the envelope, it'll still be stationery.

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woodbutcherbynight

4527 posts in 2404 days


#13 posted 05-17-2018 12:00 AM



They look like bubbles that popped, but then didn t level out. You can see the hole from the escaped air…

- dakremer

I have seen this happen when rolling paint, too little or too much product. End result is the bubbles do not pop until later. Cannot say I have ever seen it spraying anything.

-- Live to tell the stories, they sound better that way.

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dakremer

2672 posts in 3086 days


#14 posted 05-17-2018 02:44 AM

I think I’ll sand it down nice and smooth again tomorrow, and then do a really light finish coat. See if I still get bubbles

-- Hey you dang woodchucks, quit chucking my wood!!!!

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