Comparing Exterior Top Coats


I have a lot of wood to finish and protect outside.

Has anyone had experience with

General Finishes Exterior 450 Water-based Topcoat?

Earth Paints Rainforest Sealer

Seal-Krete Multi-Surface, All-Purpose Water Repellant

I'm looking for something to seal two mahogany and two pine exterior doors.

I don't care about the color changes wood does, nor the sheen.

I'm concerned about yellowing (so no oil or -thane products) and durability under serious sun.

Tell me what you've done?