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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Body - Exterior> DuPont URO 110xS Primer-Filler
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Topic Review (Newest First)
11-05-2005 09:25 PM
The stuff is hard to sand

I blocked the roof for over four hours with 400 last night and all I was able to do is knock most of the texture off of it. I used the 1104 in the past with a conventional gun, which is a medium gray and it sands fairly easily. Now I switched to the 1107, which is a dark gray, and I applied it with a HVLP gun. The darker stuff seems harder than the lighter colored stuff to sand. I switched to the darker color because I plan on using a dark base coat. Could it be the URO, types of activator or reducer, or maybe something atmospherical?
11-04-2005 03:07 PM
Scode68 Thanks Barry,

A little extra traducer did the trick. The stuff I just shot today has the same texture as the stuff shot with the regular gun.

11-04-2005 06:30 AM
BarryK Most likely your problem is the scfm.
Make sure the air regulator at the wall is wide open and do all your adjusting at the gun.
wall regulator should read 100+ pounds.
Than adjust your gun regulator to what you want .
This will get you more scfms and break the paint up better.

The offshore guns we just don't know how accurate their scfm ratings are.
11-03-2005 09:32 PM
Scode68 I adjusted the fluid and played around with the air pressure but I only went up to 40. The best I could shot was at two turns of the needle and about 33 PSI at the gun. I thought that maybe I wasnít getting enough cfm but my compressor is rated at 8.2 cfm @ 40 and the gun will work in the 7-9 range @ 40 psi. I did hook the compressor up to a pipe system that is ĹĒ and Iím running it through one of those large high flow desiccant air filters but I thought that would only help me. What I wound up doing was hitting it with a green scotch pad to chop down the high point and then I was able to sand it fairly easily with 400 grit. I think if I waited a few days it might have been harder sanding. I tried out an area on the taillight panel that I shot back in May with the other gun and it was still easier than what I just shot.

This is the gun

I sprayed with the self-etching Vari-Prime with no problem. Iím going to try more reducer next time.
11-03-2005 08:59 PM
BarryK Its a very good primer.
Normally it sprays a little grainy more so than orange peeley.
A lot of 2K primers tend to spray with a slight grain look.

If it is orange peel, I would start by adjusting your fluid adjustment in a couple of turns and you may need another 5 to 10 lbs of air pressure at gun.

If not of that works see if they allow you to add a couple of ounces of urethane reducer.
11-03-2005 04:14 PM
DuPont URO 110xS Primer-Filler

Anybody using DuPontís URO Primer-Filler with good results? Iím not sure if itís the new HVLP gun I bought but no mater what I do, I get orange peel. It didnít seem too bad with the conventional siphon gun I used in the past.

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