Composition studies (coating component and mixing ratio variations) of micro-porous coatings are performed to produce higher boiling enhancement from the flush-mounted, square heater. Two different coating methods are researched and nearly identical boiling performances are obtained with the optimized coating composition. The physical strength of the micro-porous coating is examined through a durability test and an adhesion test. Finally, the boiling performance of a micro-porous-enhanced surface is compared with that of the commercial High Flux surface.