I'm not sure how many people use this technique or even where I found it myself... but I thought I'd share. I put away this beautiful 1:32 Tamiya F16CJ several years ago when I got to the point of needing to mask off the landing gear bays and other complex areas. I couldn't figure out how to just use masking tape and didn't know any other way, so on the shelf it went. Well, fast forward several years and I'm doing far more with the hobby than I've ever done before. I used the Silly Putty to do some masking on a large scale Hulk model, so I decided I get the F16 out of moth balls, so to speak, and give it a shot. It seems like it's going to work amazingly well actually. It looks incredibly strange and fleshy, but whatever works... and it's cheap and super reusable!

2 attached images. Click to enlarge.

This stuff works really well, Brian @brithebuilder
Never used it like you did though, but this is a great practicle solution.
Thanks for sharing this.

Hi Brian. Paint the first camo color on the plane. Roll the silly putty into thin “snakes” and lay it onto the plane following the camo pattern. Spray your second color. Remember to spray close and perpendicular to the silly putty to get the fine feather edge. You can mask the first color with paper or tape if you want but my Paasche Talon dials down enough that I rarely get over spray. If need be I touch up with the first color.

A friend in Mexico taught me to use moistened toilet tissue, I thought he was nuts but it works GREAT can be molded to any shape and around any tiny part and especially in gear wells and cockpits @brithebuilder

@bikequeen - Thanks Cricket! I'm going to have to try that. Is there any issue with it sticking to the surfaces or does it come off clean?

@bikequeen, a very interesting technique, definitely going to try this.