I use rattle-can colors about 95% of the time for one (like Gloss Black on a P-61), two (as in an Olive Drab over Neutral Grey B-17), and even three-color (Mid-1943 USN/USMC Dark Blue/Intermediate Blue over White F6Fs) aircraft camoulfage schemes as well as three-color NATO Armor & Wheeled Vehicle Camouflage... One-color AFV camouflage, like US WW2/Korean War/Vietnam-era OD is perfect for rattle-can painting..
You can also get clear flat and gloss varnishes, acrylic enamels and laquers, and even some that are two-part epoxy-types, with a catalyst that gets added (automotive-quality though, and SUPER expensive. Don't bother with it, because once it's mixed, you have to "use it or lose it" immediately, since it will cure rock-hard in the paint-cup or bottle in about 10 minutes...
That said, Always, Always, ALWAYS test the clear you want to use from a rattle-can over the color-coat before you apply EITHER to your model.. For instance, Wal-Mart's "Tru-Color" enamels don't like Hobby Lobby's "TreeHouse" clear acrylic laquers, for instance.. I lost an AT-6 thataway... However, the TreeHouse clears (Matte, Satin, and Gloss) work great over Krylon, Hunter's Specialties, and Aervoe Camouflage colors..
The last two brands are available in outdoorsman/camping/military surplus stores, gun stores (or my personal favorite, the Paint/Flammable Liquids Locker at your local Army National Guard Armory) and closely match the modern US/NATO colors of Olive Drab, Mud Brown, Black, and Sand. Testor's DullCoat and GlossCoat will work too.
Keep in mind that the thickness of the clear will affect behavior too, and several thin passes are ALWAYS better than one thick pass. The faster the liquid dries, the less time it has to attack and "krinkle" the main color, plain and simple... ALWAYS allow the color-coat to fully cure, as you'll run a much lower risk of attacks on the color that way too...
But you won't go wrong, generally, if you keep the paints "matched", ie; Testor's over Testor's, Tamiya over Tamiya, etc. But test anyway..