Tungsten Disulfide is extremely lubricious. It does not stick to anything easily and has to be forcefully applied to a substrate to stick. Maximum film thickness possible is 0.5 micron (0.00002" or 0.02 thou), as one particle of WS2 does not stick to another particle of WS2. But single layer of WS2 particles is enough to provide excellent long lasting lubricity.

Mentioned below are few methods which have worked:
Spray Blasting This is most acceptable and proven method. This should be done in enclosed area such as sand blasting unit where powder dust can be contained.

Correct Method is:
1.Clean and degrease the part. Cleaner the part, better the coating adhesion.
2.Sand blast the part with 5 micron Alumina (Aluminum Oxide) powder. Only light blasting is necessary.
3.Thoroughly clean the part with soft cloth/tissue and completely remove Alumina dust from the part.
4.Sand Blast the part with WS2 powder @ 120 psi with clean and cold pneumatic air. Spray coat the part till color changes to silver gray.
5.Lightly dust off WS2 powder dust with clean soft cloth/tissue.
Blasting with Alumina and WS2 should be done in different sand blasting units. If you have a blasting unit with powder recovery system, you can reuse WS2 powder. Make sure you have fine filters on these units.
Buffing the part with WS2/Alcohol paste This method too works but takes time and is laborious.
Speed and friction determine how effectively the material bonds to the part. The greater the speed and the pressure of application, the greater the bond. For best results use a power tool. A buffing wheel, Dremel tool or even a hone can be used.

Correct Method is:
1.Clean and degrease the part.
2.Mix WS2 powder with Isopropyl (also know as Industrial) Alcohol to make paste.
3.Apply the paste on part and also on cotton buffing wheel and let it dry.
4.When paste is dry start buffing the part with buffing wheel.
5.Continue buffing/Honing till a silver gray coating is seen.
By Tumbling/Vibratory bowl coating This method is ideal for bullets and other small parts.
Speed and friction determine how effectively the material bonds to the part. The greater the speed and the pressure of application, the greater the bond. For best results use a power tool. A buffing wheel, Dremel tool or even a hone can be used.

Correct Method is:
1.Clean and degrease the part.
2.Take 5-6 small empty plastic bottles (empty aspirin bottles will do). Put few parts in the bottle and fill the bottle (up to 75%) with WS2 powder. Fill all bottles likewise.
3.Put the bottles in vibratory bowl/tumbler with sand or vibratory media.
4.Vibrate/Tumble for 4-5 hours.
5.Empty the bottles (you can reuse WS2) and wipe clean the parts with soft tissue/cloth.
Coating mating parts with adding WS2 to lubricating media:
Correct Method is:
1.Clean and degrease the part.
2.Add WS2 to the lubricating media (Gear oil in Gears, or engine oil in engine)
3.WS2 will slowly get coated on mating surfaces (by pressure rubbing) when parts move.
4.When lube media/oil change is due, add WS2 again in new oil/media.
5.After few oil/media changes the parts will be fully coated with WS2.