|Home » Forums » Professional Finishing » Message||Login|
You are not logged in. Consider these WOODWEB Member advantages:
Striping in cv6/16
I notice when I'm spraying KEMVAR cv, I'm getting some striping only on big panels is it noticeable, I always agitate really well, wet pass 50%, I do notice when I spray my doors or box coat, it doesn't show up as much, does anybody else have this issue with this particular product.
we spray kemvar exclusively. About 150 gallons a week. The only time we see stripping is when we hire a new guy that doesnt know how to set up the equipment properly..
Most likely the striping is from tails in your spray pattern. Check to make sure your tip and nozzle is very clean then adjust air until tails disappear.
Kevin is right, make sure your fan is dialed in properly.
Also, large panels can show striping if you are spraying too slow. We spray at about 600-650psi (final psi ratio) on the fluid, which means we need to move fairly quickly.
Try increasing your fluid and air pressure sufficient to allow you to move quickly. On hot days, especially, the material can flash off fast enough that even 70% overlapping can show stripes.
Another trick with KemVar is to use a touch of 100-Flash Naptha, avail from the same store. You can't use more than about 5%, and i'd start with 3%, but the naptha is compatible with KemVar and helps reduce flash-time.
Also, be sure you are using KemVar reducer. There are other solvents/cocktails that work, but I have yet to find anything that works as consistently and predictably (with the least amount of ratio tweaks) as KemVar Reducer. It's not cheap, but it is very good.
Running this time of year in the dirty hot south of Atlanta... We run over 40-50 gallons of opaque kemvar and about as much clear.... We run 3% K27 Thinner and an additional 6% Butyl Cellosolve to keep our stuff wide open for a bit so the coating can relax.... after a 20 minute flash we force dry at 120 degrees F for an hour ....cool down for minimum one hour and things can pack or stack...save your money and don't buy the kemvar reducer.... if you look up the msds it's really just marked up butyl acetate...which is also a fine reducer to help flow out if your just needing to reduce and not retard the flash...Naptha 100 or 150 stinks too much... lol