Ok, first time airbrushing on buttercream...and I'm using red. I know, I know...I thought I did all of my research. But I think I must have went too heavy or sprayed too close. First coat looked awesome. Second coat looked mottled and blotchy. Then I noticed the runs. So, I thought, I'll just blot the runs with paper towels and then respray. Now it's VERY mottled and blotchy. I've let it dry, can I just keep layering to at least make the blotchyness more subtle? Or scrape off the frosting, and re-ice with red frosting? Did I mention it's due tomorrow?? Thanks for any help! Trish

Any chance you could just cover in red fondant or modeling chocolate?

Sounds like you needed more drying time between layers.

Even with a DIY based on alcohol/vodka, airbrush colors have a LOT of water in them.

Especially on buttercream, patience is a virtue.

Several light layers with lots of drying time.

If there is an inconspicuous place, you can do a knuckle test (light tap with a knuckle) to see how the color is drying.