Try alternating: You can use one then the other 6 hours later, so they are offset by 6 hours in their delivery, giving each one the best chance of working at its best potential.
Answered 3/23/2014
4.3k views
Not studied: But the rule of thumb would be to wait 30 minutes between applications, the order is not important.
Answered 3/23/2014
4.3k views
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