Re: Question about Orange Peel

Posted by Rod (NH) on July 26, 2005 at 18:36:13 from (64.140.200.138):

In Reply to: Re: Question about Orange Peel posted by CNKS on July 26, 2005 at 05:08:23:

MR 186 should be fine for 70 or even 70+ some. It's the most common reducer I use for MTK. PPG doesn't do well in recommending temperature ranges for their additives in the OMNI line. Fast, medium, slow, etc. are not that descriptive. I have asked PPG before on the matter and got a non-responsive answer. Here's my own crude numbers for reducer and hardener that I have penciled in on the tech sheet:

MR185 - 60-70 deg F
MR186 - 70-80 deg F
MR187 - 80-90 deg F
MR188 - 90+ deg F
MH167 - 60-75 deg F
MH168 - 70-85 deg F
MH169 - 80-95 deg F

If it seems to be in the higher end of a range at the time of painting, I may choose to use the next hotter product. However, I wouldn't go hotter than MR186 at 70 deg. Since I do everything outside and am extremely dependent on the weather, I keep MR186, 187 and MH 168 on hand as the most likely to use. I don't like painting at all below 70 or above 85.

The gun I've been using for all the work on my AC-B so far has been my spot gun. That's an HVLP model so I doubt it's an issue of HVLP vs. non-HVLP. For a spot gun it has a good sized pattern at 4-5" but it's still less than the typical pattern for a full sized gun. I don't think it's an issue of pattern size either. Perhaps I am confused with your use of the term "overspray". To me, that suggests a dry, rough spray rather than orange peel. If your problem is a little orange peel in your "overspray" areas, then you are probably correct although I have not noticed that as a problem as far as any overspray is concerned. I think my own problem with orange peel in the clear resulted from holding the gun too far away and having too fast a travel speed - on a consistent basis. Not getting enough material down quick enough and wet enough to permit the best flowout on the first coat. I noticed it and tried to correct by compensating on the second coat but failed in the effort. I suppose if you are at a poor spray angle, that the overspray that you mention can result in the same effect as being too far from the surface. I have just never noticed it. I would expect the overlap on the next pass, which should be within seconds, to melt it in well - that is unless the next pass is also to far away for some reason. I have not had an orange peel problem with the MTK or even with the MC on any of my AC-B sheetmetal to date, including the gas tank - except that once with the MC on the fender. Anyway, I don't have an answer to your problem.

Follow Ups:

• Re: Question about Orange Peel CNKS 19:42:00 07/26/05 (5)
  • Re: Question about Orange Peel Rod (NH) 16:47:30 07/27/05 (4)
    • Re: Question about Orange Peel CNKS 17:20:33 07/27/05 (3)
      • Re: Question about Orange Peel Rod (NH) 19:18:20 07/27/05 (2)
        • Re: Question about Orange Peel CNKS 20:05:13 07/27/05 (1)
          • Re: Question about Orange Peel Rustyj14 15:47:15 08/18/05 (0)

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