I want to spray enamel on a boolshelf I made, but I don't know how
much thinning the enamel would take.
Is there a limit to how much I can thin the paint?
I want to use a low pressure of about 10-15 psi, but that is not
enough to create a fine spray unless I really thin the paint. So that
is my dilema.
Any help would be appreciated.
What one does is contact the gun maker and find out what needle/nozzle
size is to be used for what is being sprayed, what kind of viscosity cup
to use, what the flow rate through the cup should be, then thin as
necessary until that flow rate is achieved.
Short of that you just spend a lot of time and material testing various
combinations of thinning and gun settings.
I usually start out by adding 3/4" of thinner in the 1 quart gun cup and
fill the rest of the cup with paint. For latex I add about 1/3 water and or
flotrol and fill the rest with paint.
Give the paint manufacturor a call and ask them. The MSDS will most likely
say not to thin the paint. I ran into this with some Benjamin Moore oil
based enamal for time work. It said don't thin, but it was way to thick to
spray. I called their tech support line and told them I wanted to spray with
HVLP but needed it thinner. The nice lady said off the record I could thin
up to 50%. I asked why that wasn't published and she said it exceeded the
VOC regulations to spray the thinner. Moral of the story is that you can do
more than what the published specs say.
I didn't get the paint as thin as I wanted based on the viscosity cup, but I
used a 2.0MM tip and cut down on the material flow. I used a 4 stage Apollo
and had no problems. It came out looking great.
Just remember, apply very thin coats. In my experience, if I think it's
covering well, I'm probably spraying to much paint, hahahaha.
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