TheRailwire

General Discussion => Weathering, Detailing, and Scratchbuilding => Topic started by: pnolan48 on July 10, 2015, 11:15:11 PM

Title: Inadvertant Weathering
Post by: pnolan48 on July 10, 2015, 11:15:11 PM

It was raining hard, but I had just finished a new version of my 180' coastal tanker, so I couldn't wait to spray it with Krylon flat black. On a covered porch, I placed the hull on a small turntable, gave the can 300 shakes (about two minutes) and sprayed away. Went back in about half an hour. The flat bacl was more like dark gray, with some areas only light gray.

Like Krylon clear spray, flat black frosts under severe humidity. It was absolutely perfect for a weathered black hull. I might have spent an hour trying for the effect with an airbrush.

Title: Re: Inadvertant Weathering
Post by: peteski on July 11, 2015, 01:04:11 AM

Any spray paint will do this to some extent.  When the paint/propellant mixture leaves the high-pressure environment inside the aerosol can or inside an airbrush and enters a low (ambient) pressure environment (through the nozzle of the spray can or airbrush)  it cools instantly.  When it lands on the model it cools its surface. If the ambient air's dew point is high enough, the water vapor in the air will start to condense on the surface of the model  (or even mix with the paint traveling through the air.  Results are normally disastrous!

Good to hear that this usually unfortunate effect ended up being to your advantage.  For me it usually ruins a perfectly good paint job.

Title: Re: Inadvertant Weathering
Post by: pnolan48 on July 11, 2015, 11:01:15 PM

Pete,

I knew frosting would happen. But I was in an adventurous mood, and decided to see what would happen, and how bad it could be. I usually spray inside the house, where the A/C drops the humidity down. The customer wanted a heavily weathered ship, as most small freighters are used and abused many times over. so it was a no-lose endeavor. Sanding down a bare hull is not laborious if it failed. I think I'll do it more often when a customer wants a weathered hull. Of course, the sun will shine and humidity will be low for 30 straight days on the next "weathered" order.

Title: Re: Inadvertant Weathering
Post by: central.vermont on July 12, 2015, 08:12:22 AM

Ya know it didn't happen if there's no pics. ;) ;)

Jon

Title: Re: Inadvertant Weathering
Post by: central.vermont on July 12, 2015, 08:15:19 AM

Pete,

That's what I did to get this dusty weathered look for a friend of mine.

Jon

(http://www.n-scaler.com/gallery/albums/userpics/10003/normal_PICT0012a%7E0.jpg)

Title: Re: Inadvertant Weathering
Post by: pnolan48 on July 12, 2015, 11:31:18 AM

Pictures are coming. I have to finish the boat first.