Thread: problems with blitz black

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Hi I`am at my wits end it does not seem to matter how I shoot this paint I still get striping running my paint gun at about 35 psi tried changing how close to the panel i am shooting it at using 8-1-1 paint,reducer,hardener nothing seems to help!! thanks Bill

Check your spray pattern to make sure it is a full fan all the way across, and also alternate the direction of each coat. Spray horizontally one coat and then vertically the next coat. Also, overlap each coat about half way so you are getting a good wet pass each time and not leaving dry areas in between each pass.

One of our good painters on here may have better info, but that is what I would look at.

Don

Thanks any info helps, need all the help that I can get!

You might find some usefull reading here !!

http://www.autobody101.com/articles/

What type of gun are you using? If it's an old style siphon feed gun, 35 psi is probably too low. I run my gravity feed guns at 35-40 psi and old siphon feed guns at 45 - 55 or higher, depending on the reduction of the paint. HVLP guns can go lower...

Don's advice above is good. Each pass of the gun should overlap the previous pass by approximately 50%. If the paint goes on looking dry or gritty, it will dry that way (dull). If it goes on too wet it may run. What type of paint are you using? Is this alkyd enamel, acrylic enamel, acrylic urethane, polyurethane, epoxy, or lacquer? Is it basecoat/ clearcoat or single stage? Each type of paint has different spray characteristics. Rule of thumb: the faster a paint flashes (dries), the heavier you can lay it on...

using hvlp gun.
thanks

What sort of paint is that ??? 8-1-1 is an unusual mixing ratio ???

Maybe different over there but in england mixing ratio's are usually 2-1 + 10% thinner, Some primers here are 5-1 + 10%

Originally Posted by ranchero68/69

Hi I`am at my wits end it does not seem to matter how I shoot this paint I still get striping running my paint gun at about 35 psi tried changing how close to the panel i am shooting it at using 8-1-1 paint,reducer,hardener nothing seems to help!! thanks Bill

Originally Posted by roadster32

What sort of paint is that ??? 8-1-1 is an unusual mixing ratio ???

Maybe different over there but in england mixing ratio's are usually 2-1 + 10% thinner, Some primers here are 5-1 + 10%

Blitz Black is an enamel flat or satin paint originally designed for painting tractors and sold by John Deere. The mixing ratio probably refers to "8 parts John Deere paint : 1 part REN3001 hardener : 1 part John Deere thinner."

Originally Posted by ranchero68/69

Hi I`am at my wits end it does not seem to matter how I shoot this paint I still get striping running my paint gun at about 35 psi tried changing how close to the panel i am shooting it at using 8-1-1 paint,reducer,hardener nothing seems to help!! thanks Bill

The reason for the striping other than a bit too much pressure for a quality HVLP (28-32psi tops) is that your reducer is too fast for the temperature and humidity levels you are spraying in. Provided you are giving the usual 50% overlap and keeping your gun a consistent distance away from the panels you are shooting, the "suede black" you are shooting is starting to flash before it gets on the panel, you need to use a slower reducer so that 100% of what is coming out of the gun remains wet as it hits the panels........Also keep in mind that black Suede is not the easiest to spray, any time you use a flattening agent, or are shooting a flattened mix you need to overlap at least 50% to each pass. If you are unsure what I am talking about, make your first pass on a panel, your next pass in the opposite direction on the same panel should be spray 50% of what you just sprayed, and 50% of the virgin panel you are attempting to paint.


Bill S.

a single spray pass should cover about 6 inches and be done at about 12 inches from the surface .. if `i ammember correctly

I am trying to find a different reducer to use with this enamel every body only seems to handle stuff like acrylic enamel, not OLD school stuff anymore as I think the reducer is part of the problem. Also will try dropping the pressure down on the gun a bit.
Thanks for all the ideas so far!!

And I am not sure what the current temps are in Winnepeg, but if it is like the rest of us, right now is unusually hot. Most companies make a slow, medium, and fast reducer for varying temps. You should use a slow in Summer.

Don

Right now 88 above these guy`s only make one reducer for this paint, if you want a different reducer you have to source it from some where else.

Originally Posted by ranchero68/69

Right now 88 above these guy`s only make one reducer for this paint, if you want a different reducer you have to source it from some where else.

Who's paint are you using? At 88 degrees you need to use a hot reducer, one that slows down the evaporation and drying time of the paint product you are spraying.Forget about the difference in enamel vs acrylic enamel as the newer style enamels are polyurethane based and work well when mixed properly.




Bill S.

John Deere Blitz Black manufactured by Valspar