While the manual for the 46 AX does say to use After Run Oil, it does not specify any amount. Cool Power does contain After Run Oil in it's mixture and Morgan Fuels recommend to NOT use After Run Oils as they do not mix with their fuel. This is from their website
http://www.morganfuel.com/cp_faq.htm#4
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<a name="4" id="4"></a>Should I use after-run oil?</p></td></tr><tr><td class="detailinfo">
No!</p>
Most of our flyers don't use any after-run. Petroleum based "after-run" oils do not mix with methanol-based fuels. So,we definitely don’t recommend any petroleum based lubes. Our built-in after-run oil is one of the most universally recognized features of our fuels.</p></td></tr></table>
By using Cool Power fuel you are meeting the manual requirements of having After Run Oil in your engine, although you may be fighting an uphill battle with hobby services though.
I have used Cool Power for over 10 years and I do not use After Run Oil. I have never had any issues with rust in any of the engines that I use. As others have said though, your mileage may vary.
Ken