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PPG Surfacer is kicking my...

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Steve-KS

New User
Whats are tricks to applying this stuff. I am using MP182 with a fast hardener. I am using a 1.8 mm tip. When I spray its going on "dry". I've opened the gun all the way until its running out of the tip but it doesn't seem to help. It seems like the paint is to thick. First coat goes on the best. By the time I get to the third coat (15 minutes per coat), it barely wants to come out. There's only a one hour pot life once you add the hardener so by the time I am at the third coat its been 45 minutes. Should I mix only one coat at a time? I'm using a deVilbiss Finishline FLG3 gun. Should I go with a bigger tip? Sorry for all the questions, but this stuff is giving me fits.

Steve-KS
 
Yes, the short potlife for MP182 can be a problem at times, especially with high ambient temperatures. I suggest using the slow hardener (MH166) instead of the fast one and cutting back on the dwell time between coats some. If ambient temps are high, consider delaying application until they are more normal. For larger projects, mixing during the dwell time between coats is certainly possible since there is no required induction period after mixing. There should not be a problem with the 1.8mm tip size. Don't forget that 70F is the stated temperature for the pot life of one hour. At 80F the pot life will be shorter. Also make sure your air pressure at the gun is properly set. There should be no "running out of the tip", even with the gun fluid adjustment wide open, which is where I leave mine for most work.
 
I did the exact same thing with fast hardener, 1.8 tip yesterday morning, about 78 degrees -- no problem whatever. I should have used slow hardener, but the dealer was out of it. You don't need to wait 15 minutes -- at the temperatures we have been having it is almost ready to spray by the time you are done with the first coat. I probably had 3 coats on in about 20 minutes -- you do not want to wait on 182. Try it early in the morning and use the SLOW hardener. Fast hardener is for cool weather, slow for warm. 1.8 mm works best for me. I always have the fluid control wide open and full pattern, no matter what I am spraying. To summarize, you have the wrong hardener, temp is too high, and you are waiting too long between coats. All the specs you see are for 70 degrees.
 
You beat me by 7 seconds, and said the same thing, except I didn't mention the air pressure. I go by the maximum setting stated on the gun -- most have it.
 
Thanks for the insight guys. It was probably pushing 80-85 when I was spraying. I'll get the slow hardener and try for one of the cooler nights they are predicting later on this week.

Steve-KS
 
Yup, me too. You can even go higher if there is a need to do so - as long as you don't have any regulatory enforcement agencies looking over you shoulder. When I need a surfacer I generally apply at least four coats in a session. I have run up against that short pot life before, even with the slow hardener, beginning just as I was completing the last coat. Since then, I have been more keenly aware of that short life with 182. You can tell when the stuff starts to "kick over" - your pattern gets noticeably reduced without you doing anything. When that happens, you want to make gun cleaning a priority before it turns to jello. I don't have any of the fast reducers or hardeners. I generally only paint when the weather is mild and I prefer the slower products anyway. I've read that you can add some urethane reducer (presumably a slow one) to get it to lay down better, although that's not mentioned in the tech sheet and I've never tried it. I've never had any dry spray with it, although some orange peel can be noticeable. That's not a problem for me since it's going to be sanded smooth anyway.
 
The slower hardener should help some with the dry spray you mentioned. Also make sure you are not too far away from the surface with the gun. Your gun directions should state what is preferred. Six inches should be about right for hvlp. A greater distance would tend to encourage a dry spray condition.
 
Problem in Kansas is it isn't mild this time of year. I usually try to get through by noon. Prior to yesterday, I did apply some 170 followed by 182 in the afternoon, to cover some body filler in some depressions I didn't find until I sanded the original 182. Used a touch up gun, did not get enough on and removed too much when sanding -- thus I decided to do the whole thing again Sat morning for a uniform surface. The touch up gun gave the small pattern you mentioned. It has a 1.4 tip, the 1.8 on the large gun works much better even in cooler weather.
 
Ditto what the others said. Also with slower cat. it will let it flow/level better to help do some of the work for you.
 
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