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Antique Tractor Paint and Bodywork

Reducer, MBC MTK

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Unruh

07-26-2005 17:07:42

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I've been browsing the PPG site, but can't find any information on what temperature range the different reducers should be used at. What temperature range would MR 185, 186, etc. be used at? How much of a factor is humidity? When would retarder be used?
For my next paint job I have some MBC and some MTK of the same and right color. Can I "use up" the MBC by putting down a base coat and then top coat it with the MTK?

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Rod (NH)

07-26-2005 18:51:44

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Re: Reducer, MBC MTK in reply to Unruh, 07-26-2005 17:07:42

Hi,

Yes, the PPG OMNI tech sheets do not specify temperature ranges. See my post below for how I have interpreted them, correctly or not. I am sure humidity does have some effect but I never specifically take it into account. I just wouldn't paint when the humidity is obviously very high. A retarder is used in extremely hot weather to slow down the drying process. In my opinion, if it's hot enough to consider using a retarder, it's too hot to paint. I have read about mixing a little of the same line of retarder into a cold reducer to make it hotter but I have never tried it and think any mix ratios would be by trial and error. I supposed it could be used in a pinch that way but since I don't have experience doing it, I don't recommend it. Getting the right reducer for the temperature at hand is the best solution. I do all my painting outside and schedule it around the weather with "normal" summer temperatures. Therefore, the MR 186 and MR 187 are the two reducers that I have on hand.

The MBC basecoat is non-catalyzed. putting the MTK over it would, I suspect, result in a lifting problem. I wouldn't do it.

Rod

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BPNT

08-04-2005 20:42:36

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Re: Reducer, MBC MTK in reply to Rod (NH), 07-26-2005 18:51:44

Just my opinion...if temperature is such a concern, then why bake urethanes in bake booths at 140F? Forget about what you know, as a rule of thumb...always use the hottest temp solvent you can get your hands on (see my previous posts for reasons). The hotter solvents allow misguided overspray additional time to melt in and for dry spray to lay down. Most modern collision repair facilities cure their paints at the aforementioned 140F with no problems. MR185/186 and DT860,870, and 885 are useless unless you are painting a door handle with basecoat...

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Rod (NH)

08-05-2005 17:12:16

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Re: Reducer, MBC MTK in reply to BPNT, 08-04-2005 20:42:36

Is PPG selling useless products to unsuspecting customers still ? :o).

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