For whatever reason I spaced it on installing the coaming and only nailed the spacers in the front and not the rear of the coaming, when I went to clamp the coaming down, the rear got a bit squirly. I did the spaces first and after those dried, I added the coaming lip, but had to split the diff a lttle as the spacers seemed to widen a bit at the back seam. This has caused a gap in some areas between the edge of the spacer and the inside edge of the coaming where the coaming is overhaning a bit. I am wanting to fill this somehow and will then follow the inside coaming lip with my flush trim bit. Any suggestions on what to use as a filler to keep everything light? I bought some West 410 (similar to 407 but lighter I think) but figured I would ask before throwing it on.