[Jacobs]

We have a home located at an elevation of about 9,000 ft. We continually have problems with exterior paint peeling on the wood trim around the south facing windows. When using the same paint on metal, we haven't experienced any problems. We have used both latex and oil based primer but neither bond very long onto the wood. I even tried reducing the primer thinking it would soak into the wood and thus bond, but even that didn't work any better. Does anyone have any sugestions? Is epoxy primer available and if so would that bond better?