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What ratio aaa pump?12/14
Hi, I am looking at purchasing a Graco Merkur ES for spraying solvent based PC and AC lacquer and paint. The thickest material that I spray is PC white primer. My question is which ratio pump should I get 15:1 or 30:1?
get the 15 to 1and since you're using catalyzed material make sure to get the stainess steel model.
I have the 15:1 ratio model and it's fine for the majority of water based products I spray. Heavier primers can be a challenge
Thanks for the replies!
If you are going to use this pump as the "main" pump and spray all kinds of coatings with it, then I would think of it this way. Do you want a V6 or a V8? A V6 will move the car down the road and do everything you want,but the V8 can do it also and just not work as hard.
You don't have to thin them excessively but you do need to increase the air and fluid pressure and it works the pump harder which might make a bigger pump worthwhile if you spray a lot if that type of product.
The 15:1 pumps are wonderful for clears,stains and pigmented topcoats but thicker latex and some primers not so much. You could also get a dedicated airless for the thicker stuff.
Both Bob & Denny make good points. Bob has me pegged because I say 15-1 for the cost savings...Why spend it if you don't need to (that said I don't know what the price difference between the 2 is)? But then like Denny said I do have a little Titan 440 that I dust off a couple a times a year when somebody wants something sprayed with house paint.
Thanks for the further responses!
Thanks again for all your guidance.
One question I have on the bigger 25-30:1 pumps-
I know with my 15:1 Merkur and CAT units I can run them with a portable 30 gallon compressor and while it works hard it can be done. Some years back I had several kitchens to paint and I was running it off of a pancake compressor which is what the sales rep told me could be done. It wasn't ideal but it got the job done.
I would imagine that would not be possible with a 30:1 pump?
i am sorry i got late to this thread, a 30-1 is an overkill for wood coatings, and just because it is a 30-1 does not mean you are going to get more delivery, it depends on the gpm of the pump, don t ever buy a pump based on pressure, you need to consider delivery and that makes a difference whether you can run two guns or not
always consider the pressure needed to atomized your coatings, even the heavies primers will atomize with a 15 to one
good luck herb j
Re; air consumption
Good points but wears a pump out is how many strokes it takes to keep up with delivery at a certain pressure. Ie the pump delivery
Also if you look at the size of the ball checks on lower pressure pumps they are typically larger than those of a higher pressure pump if the delivery gm is the same. Good discussion
Good luck herb j
You're right Herb These are small pumps meant for one gun and small tips. The only difference between the two is the ability of the 30:1 to spray at higher psi it does not offer a greater max material flow. Of course the thicker material that needs higher psi to atomize also needs larger tips to pass through which means more material, more pumping, more air & more wear.
Lots to think about there...
Everybody has good input. I suggest you do this, call the sales rep and have them bring a 15:1 demo pump to use for a week. Then swap it out for a 30:1 and then make up your mind. Run the hell out of the pump!! Just remember they can swap out fluid sections and air motors and build what you want also.
in doing a little more research, the graco es looks to be a price point pump, to compete with other price ppoint pumps from other mfg
once you get above that level, their is a lot more parity in flow rate
That would be the ideal scenario Bob. Unfortunately not feasible for me, I live in Ireland and am getting the pump shipped to me from the UK.
As far as quality goes I have owned 3 different AAA units over the years. The first was an Asturo that was the first one to come off the ship from Italy in the late 90's or early 2000's that burned up in my first shop.
The Asturo was a fine unit for sure. The CAT seems to always need some part replaced including last week when I had to spend nearly $200 to buy the upgraded magnet assembly that was apparently a problem and had to be reengineered.
The Merkur is the quietest,has the best gun and I can't say anything about how it's put together because it's the only one I never have had to tear apart to fix.
The Cat is used nearly 100% for clears while the Merkur sprays pigmented water based products, primers, latex etc. I will not hesitate to buy another one.
it would be a good idea to have a rep. to demo the kremlin system. they set the standard for finishing in wood industry.
denny, i would contact ca tech directly, they do a no charge uprgrade in house colorado to the bobcat pump