Colour schemes
Typically for the USAF F-106, the airframe colour is Air Defense Grey. I still had an old bottle of enamel of Compucolor no. M145 for the grey Fed.Std 36473. This was applied with the airbrush and the coat quickly covered but took 48 hrs to dry. 

All three models got these coats.
The black nose was next masked with low tack Tamiya tape and sprayed mat black. 
The wheel bays and any open missile bay and the bay doors were painted with a paint brush interior green using White Ensign Models WEM ACUS09 enamel paint for Fed.Std 24151.

The smaller bits were not yet fitted on the model as I suggest first to do basic decalling for easier handling.  

Before doing that, the model got a couple of gloss coats of Johnson Future / Clear / Pledge with the airbrush to avoid decal silvering later as much as possible. 

I had many many decals, both from several kits and from Microscale from USA (later called SuperScale).
MicroScale also have very welcome stencilling on their decalsets, like "no steps" and airframe texts and warnings etc. 

Three schemes were picked from MicroScale set #72-196: 

(A)  early type F-106 Delta Dart got decals for the Air Defense Weapons Center;

(B)  medium type F-106 got decals of 48 FIS, Tazlanglian Devils, Langley AFB, Virginia, USA

(C)  final type F-106 got decals of 318 FIS with the "Spirit of 1976" biCentennial. 

NOTE: only later I found photos of the real aircraft! So the RED-WHITE-BLUE band on my model is far to wide! The band should be much narrower and not touch the canopy. Also, the fuel tanks should have RED-WHITE-BLUE colours, the box-art shows it also wrong.

Notes on kit (C): 
- The Microscale red-white-blue fuselage band stripes are a too wide, which I discovered too late.... ; (the Minicraft issued Spirit kit has better decals). 
- Also, I was not sure on the colouring of the supersonic fueltanks, I kept them grey as per instructions with the 1776-1976 decal set onto it. Maybe the tanks are also red-white-blue? 
- I saw also some variations on the location of the American Flag on the rear fuselage and different style of locations of smaller stencilling. 

The MicroScale system was used with their fluids Micro Sol and Set being used. The decals were all applied like the various smaller stencilling like "no steps" on the wing leading edge and trailing edge surfaces using the MicroScale decals. 

Final completion
For all models made:
- the canopy and windshield was fitted, using some white glue to fill any tiny gaps.  For kit (A) the canopy was set closed. 
Two models got the old style canopy, with a cross bar/frame in the middle running from forward to aft. This was made with a decal. 
... with cross bar

For kit (B) also a radar screen tube was fitted on the split plate.

- the rear airbrakes were set open or closed 

- air intakes got a metallic leading edge simply by painting an edge. On most intakes and the jet exhaust pipe, some ground covers were made from thin card, painted red and fitted.

- next followed fitting the gears, wheels and doors. Not the tiny bit and pieces, still to be painted...

- wing tips lights were drilled out, got a drop of Micro Kristal Kleer  and painted transparant red and blue.

- pitot was added and the tail arrestor hook added. 

- some weathering was done using a dry brush technique using 502 Abteilung oils, "engine grease". Particularly over the raised rivets this gives a good effect and adds life to the overall finish and look of the model. 

- kit (C) made also got a couple of Falcon missiles fitted in the open bay: 
In the kit only very rough later type AIM-4F Falcons are included. 

Slots were cut with a razor saw to get a slot between the forward missile fins and the rear fins. Small bars were added from sprue. Missiles were painted red with white front sections. 
..

(You can also used missiles from the Hasegawa 1/72 weapons set no. III , issued in the nineteen nineties). 

The missiles were fitted on their launch bars in the F-106 missile bay. Note that the configuration of the bay differs from a F-102 Deuce. 

Finally all the models got a sealing matt varnish coat using Johnson Future / Clear / Pledge with 15% Tamiya Flat Base X-21 acrylic mixed in to get a semi-matt result. These coats were applied with the airbrush. 
 

That completes the build on no less than 3  U.S.A.F. F-106 Delta Darts. 

(B)  medium type F-106 of 48 FIS USAF; based at LANGLEY AFB, USA

Clean lines with closed missile bay and almost closed rear airbrakes

.

(C)  final type F-106 of 318 FIS (fighter Interceptor Squadron USAF), in 1976 Spirit scheme, "Dragons" of McChord AFB, Tacoma WA, USA. 
Kit with many details like avionics bay, open missile bay, open canopy and open rear air brakes. 

NOTE: only later I found photos of the real aircraft! So the RED-WHITE-BLUE band on my model is far to wide! The band should be much narrower and not touch the canopy. Also, the fuel tanks should have RED-WHITE-BLUE colours, the box-art shows it also wrong. 

still barren missile bay... a few Falcons to be added....

(C) has the clear canopy without cross bar. Strictly, the shape of the older style canopy and later style canopy is a bit different as well, the later one being a bit more "bulgy". But in 1/72 scale this can hardly be seen. The kit canopy was used here. 

The avionic hatch opens upwards, this hatch being made of thin plastic card. Tiny locks were also made.

.
.....with below additional detail behind the seat

Note the slightly drooped traling edge surfaces. 

..

As noted before: the RED-WHITE-BLUE band on my model is far to wide! The band should be much narrower and not touch the canopy. Also, the fuel tanks should have RED-WHITE-BLUE colours.

A nice bunch of Delta Darts are now in the 1/72 model collection, which sit nicely to the other "Century" series of 1/72 models including a F-106B two seater...