No, you should not use Multicoat Acrathane Colorseal to help epoxy stick to ceramic tile. Acrathane Colorseal is a water-based, acrylic-modified resin sealer explicitly formulated for porous, cementitious substrates like concrete, masonry, and pool deck overlays. It will fail to bond safely to smooth, non-porous glazed ceramic tiles, and applying a heavy epoxy layer on top of it will cause the entire system to peel and delaminate.