Azek Trimboard

[PigInAPoke]

I just trimmed some white vinyl replacement windows with Azek Trimboard. I installed the trimboard using an air nailer with stainless steel nails. What is the best product (caulk?) that will not turn yellow to cover up the nail holes?

[TheWindowNerd]

A friend of mine uses white silconized latex, DAP plus.
Cut a small tip, fill whole to excess, let dry 24 hours, shave off excess with new utility or razor blade.

[PigInAPoke]

I just called Azek and they recommended an acrylic-based caulk or a polyurethane-based caulk but NOT a silicone-based caulk. Between an acrylic-based or polyurethane-based Azek would not say which one is better nor would they recommend a specific brand. So, can anyone recommend a specific brand of acrylic-based caulk or polyurethane-based caulk to use for this project? Which is easier to work with and clean up - acrylic or polyurethane? More importantly, which is less likely to yellow over the long haul? Any advice would be greatly appreciated. Thank you!

[TheWindowNerd]

Dap/ Alex Plus is latex base.