Using slow reducer and activator in cold weather? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-17-2011, 11:31 PM
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Using slow reducer and activator in cold weather?

So I bought SPI slow activator for the clear and have slow reducer for the base.. Unfortunately, I planned on having this done during the summer, but she's pushing October and I haven't even layed the high build on.. sigh..

What are some pitfalls of using this in cold weather? I assume more chance of runs, longer flash times... But any deal breaker? Dreadful idea?

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Old 09-18-2011, 04:50 PM
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Anybody? Slow reducer, cold weather?
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Old 09-18-2011, 05:03 PM
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Yup. The choice of reducer is generally dictated by ambient temperature.

In "cold" temperatures (50 - 70F) you should be using a "fast" reducer, like Sherwin-Williams # DR631.

Quote:
A cold weather reducer used in various DIMENSION systems DIMENSION Reducer Temperature Range Guide: DR631 Fast(50-70 F) DR632 Cool(70-80 F) DR633 Moderate(80-90 F) DR634 Warm(85-90 F) DR635 Hot(95 F & Above) DR636 Tropical (100 F & Above)
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Old 09-18-2011, 05:30 PM
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Your parts store will likely let you switch it for the proper products....worth a shot anyways
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Old 09-18-2011, 06:12 PM
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If it has not been opened, try to trade it.
In cold weather, there is a possibility that the paint will not cure. Remember it is the temperature of the panel, not air temperature, that you need to worry about. You might be able to get away with using it, if the panel is facing the sun, in the early afternoon.

One thing I do is to take careful notes of all the conditions, mix ratios, application techniques, and anything else I can think of that might affect the paint. If it works as is desired, you can duplicate what you did. If it does not work, you have a record of what not to do.
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Old 09-18-2011, 06:53 PM
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Well, will Barry switch them?

I will be doing it in the garage, where I can slowly heat it up (240v heater).. So I could warm the garage.. open to spray.. Close it and heat it, I suppose.
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Old 09-18-2011, 07:56 PM
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It's the temp of the item being painted thats the main issue. I painted this gas tank in my unheated garage in the middle of winter using medium reducer. The temp was about 40 degrees.... BUT I used heat lamps to warm the part before, during and after being painted and it came out perfect. If your part isn't at least 45 degrees the paint won't be able to crosslink and harden. Then you'll just have a big mess.

If you can't get your part warm enough or if you're really concerned about it, Barry will probably help you out. He's great to deal with.





Good luck.

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Old 09-18-2011, 09:03 PM
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Oh, I mean, I hope to have the ambient temp about 70 or so.. Nothing down that far.. That cold I'd have to (grumble grumble) wait until next spring... But what about slow reducer (meant for 85+) used at 70? Besides flash times, any problems?
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Old 09-18-2011, 09:07 PM
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what about running kerosene heater
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Old 09-18-2011, 09:12 PM
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what about running kerosene heater
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Old 09-18-2011, 09:28 PM
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It's not heating the garage that's a problem (No kersosene though.. I just prefer small electric ones).. It's the fact that the door has to be opened to paint the thing and let's all the heat out.
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Old 09-18-2011, 09:48 PM
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Quote:
Originally Posted by mitmaks
what about running kerosene heater
You don't want to run any kind of heater that will have a flame (kerosene or propane) when painting. Paint fumes can be explosive!


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Old 09-19-2011, 06:04 AM
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NO HEATER that has flame or glowing elements which eliminates most electric heaters too. An oil bath would be OK, but they are slow. Get some heat lamps - like a baking booth. We wont want to read about a guy in the North country who blew his shop and himself up.

As far as kerosene heaters - most emit an exhaust which contains unburned hydro carbons and will leave a film. That film will mean paint failure. I used a couple Mr Heater propane heaters to warm parts, but turned them off to paint, then used heat lamps to maintain some heat though the initial dry period.

Get it done - there will be more warm days coming, even in October
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Old 09-19-2011, 08:09 AM
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Quote:
Originally Posted by Irelands child
there will be more warm days coming, even in October
He lves in Canada
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Old 09-19-2011, 08:41 AM
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Well he mentioned the North.. There hopefully will be warm days! I'm not worried about explosions, it's all in a plastic film booth..

But, seriously, 70 degree weather, slow reducer? Bad? I've heard, but never tried, that you can always use a slower reducer, but not a faster one?
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