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Ryan, i would assume your talking about the Pigmented kemvar plus since your reducing it 50% .. the clear conversion varnish doesnt require reduction (ive been using SW products for over a decade with great results).
If you're getting tails on your spray pattern (more material towards outside of fan) it would be on the spray equipment side. maybe you need to tweak your air/material outputs. Over thinning your material may help but its not ideal.
what are you using for thinner?
With the sherwin williams kemvar plus, lacquer thinner will give you spotty results. (Like jim said). They have Kemvar Reducer that is intended for use with this product and does the job well. I use it in any pigmented jobs that are not being topcoated with clear. If im clear coating over the pigmented cv then i just use lac thinner in the color coat
I also had this same problem with SW water white CV. After several long discussions with the SW coatings team we figured out I wasn't agitating good enough. Sounds dumb but it doesn't remix as well as lacquer, which I switched from. All coatings are high gloss and the part that settles out is the sheen inhibitor. No problems since I bought a mixing drill bit from SW. Maybe this is the problem. I also quit over thinning the CV, its a different animal than lacquer and I figured it out finally.
Use R7K310 reducer for Kemvar Plus
I use the Kemvar plus and you butyl acetate up to 40% without effecting sheen
Gives a much better lay down and Is a fraction of the price of the kemvar thinner blend..
I mix my own pigments using Phoenix and 844 colorant...
Darker colors require using a blending clr cv as well as white...much thicker and requires much more reduction
at which time I have a butyl acetate, xylene and high flash naphtha mix that still is a fraction of the price..
Tails are not necessarily due to equipment..but if product is to thick,,for your 1.4 then your going to have a dry spray.
Try using a larger tip if your afraid reducing will affect sheen 1.8
Binks 2100's have a 66SS fluid tip that's equal to a 1.7