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Old 07-14-2005, 11:23 PM
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polyprimer Gun tip sizes

i just bought a gallon of polyester primer to spray on my project, i have a hvlp ( the infamous harbor freight purple gun) that i use for primer, it came with a 1.4mm tip, however this tip was good for epoxy, its obviously going to be too small for this poly primer.

the optional tips i can get is a 1.7mm a 1.9mm or a 2.2mm

which one would best suit my needs? im thinking the 1.9mm but i would like opinions from those who know more than i do

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Old 07-15-2005, 12:48 AM
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anyone???? im gonna go to the store tomorrow morning
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Old 07-15-2005, 04:38 AM
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I also tried to use my HF (purple) gun to spray polyester primer. Works OK for about the first 30 seconds then starts leaning out. I have an old Binks #69 suction gun that has a 1.7mm tip and it sprays the polyester primer just fine. I think if you can find an inexpensive gun with a tip size around 1.7mm you will be fine. There is a 2.1mm tip and needle for the purple gun, but it is too big for polyester primer and is for latex paint.

Vince
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Old 07-15-2005, 06:46 AM
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The 1.7 or 1.9 will do fine. Must be nice to get tip set's AT the store. I have to order online here.

The primer should give a recomended size on the can. Feather Fill 2 does.
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Old 07-15-2005, 07:05 AM
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A 1.7 tip or bigger will work.
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Old 07-15-2005, 10:30 AM
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I have an old HF hvlp gun and i havea 2.2 in that just for poly primer.. but i use the car system poly primer and its super thick.. i have to thin it a little to even get it through this smoothly.
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Old 07-15-2005, 11:23 AM
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Quote:
Originally Posted by Bee4Me
The 1.7 or 1.9 will do fine. Must be nice to get tip set's AT the store. I have to order online here.

The primer should give a recomended size on the can. Feather Fill 2 does.

ya at first they were telling me i had to order online, but sence i live near the california distributing center im going to stop by there, i called and they said they have them
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Old 07-15-2005, 05:43 PM
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my primer gun has a 1.7 and i found it to work with poly primer but it is a little small. i recommend a 1.9 or larger would be fine.
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Old 07-15-2005, 08:23 PM
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funny you should ask this, I'm waiting for the poly-primer I just put down to dry so I can pack up for the night.
Anyways, I use the same gun as you and have been spraying poly-primer using the 2.2 tip for it. I use slicksand and it flows through it just fine. I have trouble getting good atomization, which I think means the 2.2 tip is too big. I always have bad orange peel on my finish, but thankfully its only primer and I can block it down before putting on the final coat.

I would say go with the 1.9.
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Old 07-15-2005, 08:37 PM
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Some more advice.
Using poly's that have the CLEAR activator,same as f'glass ,
DO NOT leave it in the gun long or IF you use a "little" too much activator,
It will harden in the GUN brfore you know it.
I mixed up a little batch of Feather Fill last night and guess I overactivated it and went to lay on the 2nd. coat and it wouldn't spray.
Opened the cup and it was almost HARDENED.
If you feel the cup and it's getting warm, Might want to dump it before you end up with a mess.
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Old 07-16-2005, 12:30 AM
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well i bought the 1.9mm tip today, i will test it out tomorrow if its sunny, i bought a warrenty on my gun so if it gets unfixably clogged i can exchange it for a new one, no questions asked

how many drops of hardener do u put in?, im using pcl polyfill, it says mix one "large tube" (2oz.) of mekp hardner with one gallon, i figure i will spray about a half a quart of primer each time i use it, so do i just devide the ammount of hardner by 8? thats how i think it works right,

off hand does any one know how many oz are in a ml? b/c i dont want to over/under mix, b/c thats never good.

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Old 07-16-2005, 12:35 AM
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never mind


1 US fluid ounce = 29.5735297 ml

so 60oz/8= 7.5ml and thats how much i mix if i spray 1/2 quart?

i think thats right, Man "Summer mode" has all ready kicked in,
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Old 07-16-2005, 06:35 AM
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You're right just divide your hardener into 8 parts. The Featherfill 2G I've been using comes with 4 small tubes of hardener that have graduations printed on them-sure makes life easy. I can accurately mix 1/8 quart. My supplier sells it to me at a very economical $38 per gallon . I've never heard of PCL-good stuff? PCL-who makes it? Bob
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Old 07-16-2005, 12:25 PM
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http://www.pclautomotive.com/catalog.html its easy to get here in california,relitively cheep,. i asume its good, never tried the polyprimer, but i like their 2k acrylic urethaine primers, good stuff but expensive $130 a gallon

ive seen boyd codington (american hotrod) use this polyprimer on his tv show, i would assume its good quality, i will tell u how i like it when i spray it (dosnt look like it will be today because the weather is still crappy)
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Old 07-16-2005, 02:09 PM
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Quote:
Originally Posted by guba_unus
funny you should ask this, I'm waiting for the poly-primer I just put down to dry so I can pack up for the night.
Anyways, I use the same gun as you and have been spraying poly-primer using the 2.2 tip for it. I use slicksand and it flows through it just fine. I have trouble getting good atomization, which I think means the 2.2 tip is too big. I always have bad orange peel on my finish, but thankfully its only primer and I can block it down before putting on the final coat.

I would say go with the 1.9.
I just sprayed slicksand with a 2.0 mm gun and it sprayed great.
However, I did find thinning it down with about 10 -15% with acetone helps quite a bit.
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