Well, the reason I switch over is to stay in system. Vinylester is a great resin for the skin repair. I like to use mat in the skin repair. Vinylester solvents dissolve the sizing or Starch if the name works better holding the mat strands together. Most boats have chopper shot in at this location, they roll it down after to level while in the mold. That being the manufacturer's choice I like to stay in system. Remember, mix some Vinylester in with the Rage Gold before using as a fairing compound. I leave the lid off to allow some of the solvents to gas off thickening the final product. I personally never use anything but West Epoxy inside a Transom. Only switching after moving to the outer side of the outer skin. I just makes fairing so much easier and faster. Any cosmetic work is not what gives the repair integrity. If you have a 1/4in skin times 12 is 3inches. That is plenty of mat to hold it together. A Coosa 26 Core, Epoxied in, is almost bulletproof by itself in my humble opinion.