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Spraying sealer from 55 gal drums5/11
I manage the finish dept. in a small shop. We spray a lot of SW hi build pre cat, sealing first with vinyl sealer. We spray other paint finishes as well, so we might use 15 gallons of sealer per week, more or less. I would like to start spraying sealer from 55 gal drums. Reasons: cut down on acetone use, less hazardous waste to dispose of, not have to change back and forth between sealer and top coat. I can leave the sealer gun set up and not have to run acetone through the line every night. A little cheaper per gallon.
My SW rep won't sell me sealer in a 55 unless I use 55 gal per week. Says it can't be under agitation for longer than a week. T67FH67 is good catalyzed for 6 months. I will probably use a drum in 4-5 weeks. I will only be agitating the drum 8 hours per day. Has anyone ever heard of this before, or is my SW rep jerking my chain? I sprayed from a 55 in another shop and it took us at least 3 weeks to go through a drum. Never had a problem .
here is my take, as far as agitation he is most likely concerned that most people peg out the agitator air motor and whip a lot of air into the coating, my suggestion would be to get a back geared agitator more expensive but has a lot of torque to mix the material and would be hard to whip in a bunch of air, frankly i have never heard that a material can't be mixed for a week max, especially a vinyl sealer i know i have no issues agitated ml campbell sealer but i don't peg out the air motor
good luck herb j
I agree with Herb about the low speed stirrer. Is it an open head drum? If so, I would be concerned with solvent evaporation over that long a period.
your TDS sheets for the Sherwin precat high build/sealer combination will show you that you should be catalyzing that vinyl sealer with V66V26 if your using a catalyzed product over the top. your tech/sales guy should have had that info to you a long time ago.
ok I misread the product number. The F6 is precatalyzed vinyl and the F7 is a post cat.. nevermind I'm wrong.
Thanks guys. It is a closed drum. Rep now says he is worried about viscosity change because of long term agitation, but will sell it to me to try anyway. I don't forsee any problems. I will monitor viscosity and add a little reducer or retarder if needed towards the end. Thank you for the comments.
He has warned you and he is selling you want you want. You own it now. I would have said the same thing. If you can't use it in a weeks time, you shouldn't buy it in that container. He's just trying to look out for you and you called him a jerk. But what really stands out is what is with you saving on acetone? Your story doesn't make any sense. Why will you use less going to a drum?
I only use about 5 gallons a week of post cat sealer but much like you l got tired of cleaning the pump between sealer and finish coats so l just bought a 5gal agitated pot. With a 6 month pot life on the sealer there's no need to clean it when it's empty l just pour in another 5 gallons. Plus no worry about evarporation as I have ball valves on the air lines, when done spraying just close them up and wipe off the gun. great time and solvent saver. I don't see why a 15 gallon pot wouldn't work for you.
I don't know your specific setup, but unless you're getting a significant price break buying it in 55s instead of 5s, I wouldn't bother. That's a lot of flammable material sitting around, especially if it's kept inside your shop.
We spray 30-60 cabinet doors per day, so my usage probably isn't as much as yours is, but I'd have to triple or quadruple in volume before I'd consider buying anything but wash thinner in 55g drums.
I definitely have kept vinyl sealer in 5 gallon cans, agitating it only during working hours, and sipped on the same can for several weeks (lower volume shop, spraying Sherwood precat over the sealer). Didn't have any problems there as long as the sealer didn't clump on the bottom over the weekend (usually did, had to stir by hand before leaving it to the agitator).
Slow agitation is the key. Just keep that propeller fan air motor going "putt putt putt putt"