Hi everybody, its not very nice here. Its 50 degrees F with showers. I would like to have a couple of coats of base coat sprayed today but I'm not sure if the weathers nice enough.

Will the cool air and high humidity ruin the paint or is it OK to spray and it will just take longer to dry? The weather is not really going to improve in the next couple of days.


ash

 

Never paint when the humidity is high and the temperature below 60 degrees. It wont dry properly and will turn out like crap. Just wait until its nice and dry out.

 

Dont paint when the temp is below 60 and the humidity is high. Wont dry properly and will turn out like crap.

 

Damn it. Stupid thing gets sticky sometimes.

 

Also some paints can cure to high humidity, so once those droplets leave the spray gun, it turns into dust

 

I looked at the title of the thread, and somehow I knew you were associated with the MD area.

 

The manufacturer will tell you what temperature and humidity range is acceptable for your paint.. I'd suggest you listen to them, they know what they're talking about If it is acceptable to paint in rain/humidity, then what you HAVE To do is make sure you have a water trap on your compressor, make sure you have one of the moisture trap ***** right before your gun (your local auto painting supply store will know what I'm talking about), and what I do for extra measure is just slighty crack the bleed valve at hte bottom of the compressor tank.. this will allow extra water to exit out hte bottom, instead of through the gun. If you find ANY signs of water being shot through the gun, stop painting, clean up, and wait until it gets dry enough for your equipment to deal with it. Don't forget to sand down the water spots first, of course.

 

I agree 100%. I had to use 2 water traps off the compressor and I went through lots of those disposable dessicant things to keep things dry when I was painting. It was usually warm, but pretty humid and the paint sprayed fine.

Ask the people at the paint store for the information on your specific paint, they should be knowledgeable enough to tell you whether or not you can spray in those conditions.

 

Even with a water trap, 2, and the screw on filter at the bottom of the gun, I've gotten water in my paint before. My local supplier now sells desicant snakes, no more problems. They are good for about 40 hours of spraying.

You need to get some heat in where you are spraying and dry the area out some. Humidity needs to be below 50% and temp around 70.

 

I work on aircraft, its a big no no to paint when theres high humidity (60% and up) or if its raining. Water and moister will get trapped under the paint and cause anode and cathodic (Filiform Corrosion) activity to take place under the paint and create worm like grooves in the metal. hope that helps