You did the wrong thing by applying interior products on outside rough cedar. You should use a penetrating "pre-tinted" sealer/stain for the natural look. Do not by any means apply a polyurethane or the minwax. The wood should not be shiny but natural looking. You also cannot any of our products over the minwax.
All of the
Defy products are good.
You could try
www.saversystems.com for some sample colors.