Let me rephrase.... It would not be necessary.......
I am familiar with OCW and it's a nice product. I looked into it when it was popular in the States and first started appearing over here. However, I was looking for a more 'complete' range to stock and although Optimum are very good, there wasn't much info around on all the products, where as Duragloss were already proven, and filled the gap I was looking for where I had decided to do away with alot of the Meguiars range...... It also mean't I wasn't just following in other suppliers footsteps.
And your right, there is nothing wrong with layering waxes but, why do it with two different ones when you already have a very wet finishing wax sitting in front of you?
L33 BYT, If you want wetter still, try 'spit shining' the Natty's Blue. Apply the wax to a couple of panels. Don't remove it but, as it starts to haze, spritz it with a QD spray, and then apply a second layer of the Natty's Blue over the top. Then once cured, remove the wax. Many people notice a difference compared to just putting two coats of wax on separately....... Something to try anyway

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Cheers.