Three things at once in the above image:
1.) I trimmed the plain weave, four ounce fiberglass cloth as closely as I could to the edge of the blade. This is important because if too much cloth is left overhanging the edge, the epoxy ‘flows’ out along this fiber and hardens. This adds enough weight and stiffness at just the right time and in exactly the wrong spot, resulting in the cloth ‘lifting’ off the blade. Think of a seesaw, where the blade edge is the fulcrum in the middle, and the outboard fiber and its cargo of epoxy is bending down, just like the heavier kid on the seesaw. If this occurs and goes unfixed, the result is a ‘white line’ along the blade edge where these long fibers were allowed. The white line is air that is now trapped under the cloth in the space that was made as the cloth lifted up of the surface. TRIM any excess cloth. Make the edge of the cloth fit the blade as best your scissors and steady hand will allow.
2.) Blue tape along the UNDERSIDE of the blade serves as the surface on which any drips will harden. When all is done you just pull the tape off, taking with it all the hardened stalagmites (or is it stalagtites?) that formed as that drip fell off the edge. Without tape the drip still happens, but it bonds with the wood and is much harder to cleanly remove.
3.) Use a small level to check that the blade is level in all directions. A dipping blade makes it easy for the epoxy to flow downhill resulting in a thicker layer on that lower side and a thinner layer on the higher side. This can also make it easier for dripping off that low edge, resulting in those undesired stalagmites on the underside.
Anything is fixable, but why make your project more difficult? A few minutes of prep time can make your project less stressful, especially that first paddle upon which so much is ‘learned’. You can make that learning have a good outcome, or you can make it more frustrating…….
P.S. I like doing the power face first as seen in the pic above, the cloth is simpler to work with, as you do not need to cut the slot for the shaft. Also a simple vise to hold the paddle shaft makes for an easier epoxy experience. Tune in next time for an easy way to cut that backside slot out.