Motocryl

'68 Coronet R/T said:
At times it is. Yesterday was 100 degrees and we had high 90s leading up to that.
I tell people that in the higher altitudes we get two hot months and two cold months (even snow) but the rest of the year is mid 70s to low 80s.
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Phoenix and the lower portion of the state are another story altogether.
My wife and I flew out of Phoenix at 11:20pm on June 11th. The temperature when we got to Phoenix at 10pm was 100 degrees. The high forecast for today is 113 degrees. :eek:
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Mid 70’s low 80’s and low humidity I’d be in heaven. I see that like 3 days out of the year.
 
Ok tomorrow we ride…..

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Chris_Hamilton said:
Only if they are inline. Meaning blend slow with extra slow, slow with normal, etc. You don't want to blend activator or reducer that are two or more steps apart from each other. I.E. normal with extra slow. Fast with slow, etc.
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What happens if you do? Asking for a friend? ;)
 
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dhutton01 said:
What happens if you do? Asking for a friend? ;)
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With reducer you have issues with tail solvents. Say you blend normal with extra slow. Depending on the temp its used at, it will flash off but the tail solvents from the extra slow will still be underneath. So trapped solvents, dieback etc can occur.

Similar with activators. I can't give you a complete and technical answer though as my knowledge of exactly why is limited. My understanding though it's similar to reducer in that the chemistry of say normal is formulated for a specific temp and the chemistry of extra slow is formulated for another. Blending them doesn't then change it to the midpoint of the two. There is enough leeway for inline activators though.

That's my understanding of it. Two different paint reps from PPG and RM/Glasurit both told me the same thing. All I know. Maybe Barry or someone else can give a better reason why. I just know enough not to do it. :)
 
Results are disappointing. Hood still full of pinholes. Added another oil trap as well as the AC dryer. Cleaned up a fender and cut the fluid back a half a turn. Did not hit it hard enough to give it a wet shine did 4 coats like that and it did not pin hole. Decided to open up 1/2 turn and put the last coat on wet. Pin holes returned.

This was with the extra slow activator and slow SPI reducer (10%).

Thoughts.
 
JimKueneman said:
Results are disappointing. Hood still full of pinholes. Added another oil trap as well as the AC dryer. Cleaned up a fender and cut the fluid back a half a turn. Did not hit it hard enough to give it a wet shine did 4 coats like that and it did not pin hole. Decided to open up 1/2 turn and put the last coat on wet. Pin holes returned.

This was with the extra slow activator and slow SPI reducer (10%).

Thoughts.
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Well it rules out contamination IMO. I think.....

Only thing I would know to try is going to extra slow reducer (SPI) and some urethane retarder. 2oz per 32oz RTS.

One thing did you notice the pinholes immediately or did it take a bit of time. If you noticed immediately did you notice it actually "popping" or bubbling as you sprayed? Or did it "fisheye" immediately?
 
They showed up within a few minutes and continued to get worse. I have not been able to see them actually develop. It was 75F when we started and the extra slow is for 95F so it was very slow. I did get some reducer but we consumed pint of paint. It was clearly drying much slower and was still soft when we left. (1 hr)
 
I’m still going with the mile high elevation. Something in the Motocryl mix is not happy at low atmospheric pressure.
 
JimKueneman said:
They showed up within a few minutes and continued to get worse. I have not been able to see them actually develop. It was 75F when we started and the extra slow is for 95F so it was very slow. I did get some reducer but we consumed pint of paint. It was clearly drying much slower and was still soft when we left. (1 hr)
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Well it sounds like solvent pop. Do you have any urethane retarder? That would be what I'd do next. 2oz per 32oz.

How much air movement where you are spraying? Is this in a booth? If a lot of air is moving cut it back however you can to a bare minimum. If you are simply painting in the open Shop floor this isn't an issue. Just trying to think of all possible causes.

I think the retarder will solve it. 2-3 oz per 32oz RTS is what I'd try next. And remember Jim, no good deed goes unpunished. :)
 
Chris_Hamilton said:
Well it sounds like solvent pop. Do you have any urethane retarder? That would be what I'd do next. 2oz per 32oz.

How much air movement where you are spraying? Is this in a booth? If a lot of air is moving cut it back however you can to a bare minimum. If you are simply painting in the open Shop floor this isn't an issue. Just trying to think of all possible causes.

I think the retarder will solve it. 2-3 oz per 32oz RTS is what I'd try next. And remember Jim, no good deed goes unpunished. :)
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Open shop floor. I turned the AC off in the shop as well
 
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