Painting with PPG

[Anonymous-0]

Started to paint a few parts, but missed a couple spots due to bad light. Can I just recoat those areas or do I need to scuff first and then recoat?

 

[CNKS]

You didn't say which PPG paint you were using. I would say if you do it within 24 hrs, it is ok, If longer, then scuff it, provided it has cured enough--it may not work if you used MAE without hardener. If it is unhardened Omni acrylic enamel (MAE), that one has no recoat interval, so you are on your own. If it Omni acrylic urethane, you can scuff and recoat anytime.

 

[MNGB]

I save what is left in the spray gun in a cup and then touch up the thin spots with a brush works best on cast but can get small areas of other surfaces with a brush I've gone back after a week or more and had good results.

 

[CNKS]

I have done that too. I think mostly the lack of a recoat interval for MAE is for large areas where the person was not quite satisfied and wanted to add another coat. Rod(NH) has contacted PPG about this and PPG says they are not willing to give an interval. Small area touchup with a brush on cast or sheet metal likely will not cause any problems. I have no hesitation about that. If you spray the whole area it may or may not cause problems.

 

[Anonymous-0]

Sorry I wasn't more specific. It's PPG omni w/ hardner. Looks good what I've done so far except for this small area I missed on the fan shroud. I could let it go, but I like it to be right. I was hoping to just cover that spot next time I get the paint gun out. Our temps here have dipped to the mid 40's, and my barn is not heated, so I will not attempt any painting until temps get up to 70, which in my area may not be until mid May. We had a spurt of unusually warm weather, so I was trying to take advantage of that.

 

[Rod (NH)]

Assuming you are talking either OMNI MAE acrylic enamel or OMNI MTK acrylic urethane, as long as you used the appropriate hardener, you should be good to go with scuffing the entire part and reshooting it. Trying to only cover just a part of the piece will likely lead to overspray problems unless you can mask off the area along natural lines of demarcation.

 

[Anonymous-0]

It's Omni MTK. I'll probably scuff the whole part and then reshoot. At this point, I'm just going to wait for warmer weather and good light so I can do everything right. This is the first time I've used PPG, and to me it seems a little thin, which I would think requires more coats (at least three), I like what it looks like on the parts I did coat successfully.

 

[Rod (NH)]

PPG's OMNI is an "economical" line of automotive paints. It's not a premium line. For PPG's premium equivalent to OMNI MTK you would use "Concept" DCC acrylic urethane. That product is more heavily bodied, covers a little better and goes farther on an as-mixed basis but is significantly more expensive. At least in orange I have never found MTK to need more than three coats. In DCC, two can suffice. I personally like MTK because I believe it provides very good quality at a reasonable cost. Even if one figures that MTK needs three coats where DCC needs two, the total material cost is still significantly less per square foot for the MTK with no apparent decrease in quality or durability, in my opinion. Color matching on relatively new automobile panels however is a different story. For that purpose the premium products should be the only choices as that is where the expensive ones will easily out-perform the "economy" ones.