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pin holes in finish

1/3/19       
Eric Wegner

We are having an issue with pinholes in our paint (chemcraft post cat lacquer) when spraying on MDF. This just started about a month ago. It seems to show up in the primer in some cases as well. As the paint levels out it looks like soda pop fizzing on the the surface for a few minutes and then forms these tiny pin holes. This is not over the entire surface, just the odd spot and not on all parts. We've used different samples of MDF all resulting the same. We are using a slow reducer and covering 4-5 wet mils. This is not happening with our clear coats, only paint.
Any suggestions??

1/3/19       #2: pin holes in finish ...
PKD

Website: http://www.premierekitchensllc.com

you might have water in the air line causing this issue.Some people call this fish eyeing.
Have you contacted your paint supplier about the issue ?

1/3/19       #3: pin holes in finish ...
Ryus Thing Member

Website: http://www.kaslan.cn/

This problem is generally caused by two reasons: 1, the paint used is incompatible with the original paint.
There are a lot of bubbles due to chemical action. 2, the paint concentration is not appropriate or added diluent is not right. Some diluent will produce a large number of micro-bubbles, in the viscosity of the paint when used, after the brush bubble can not break, will cause the surface is not smooth, poor transparency, the concentration is not suitable will also make the brush after the micro-bubble is not easy to break, resulting in non-smooth surface, poor transparency. Solution, can only find the nearest experienced Oiler master, help you to adjust the paint or give you on-site guidance

1/3/19       #4: pin holes in finish ...
rich c.

Sounds like solvent pop. What is your recoat time? Viscosity might be too heavy.

1/4/19       #5: pin holes in finish ...
Dan Cook

Finish that is showing micro bubbles is either drying too fast or coating is too thick and is skinning over at the surface before the solvent is escaping. Slow down the dry time with retarder or apply less finish. You also may be having too much air passing over the surface as it is drying causing the surface to skin over before solvent escapes. Cut down air as soon as finish is applied until solvent escapes and finish begins to skin over. Once solvent escapes you can increase air flow again.

1/4/19       #6: pin holes in finish ...
Eric Wegner

Thanks everyone for your responses. The problem ended up being an issue with our pump. The top end had some wear and required a re-build. Definitely had some seal issues causing problems with the fluid and air lines resulting in inconsistent patterns and coverage.
We ran several test pieces today, all of which are perfect.


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