Lightly spray on axles and lube as directed with DD4H. Some people add oil, shake off the excess and insert into wheels. Some people wick any extra oil with small pieces of paper and insert into wheels.
Side Note: Unlike Jig, Max Pro says it's plastic safe and I've tested it on a junk set of wheels to see if there is any danger of melting the plastic. Immediately after spraying on the wheels I didn't see or feel any adverse affects. After spraying the axles, I still waited 15 minutes as a precaution before inserting them in the wheels.