Can Pond Shield be applied over other old coatings?
Yes. However, you should take care to properly prepare the surface prior to applying Pond Shield. Be sure to remove any old coating that is coming off, but the best case scenario is to remove all of the old coating prior to application. It’s best not to rely on the failing bond of the old coating. If you find that some of the old coating is still bonding sufficiently, then you should sand the remainder with at least 60-grit sandpaper to give the material tooth.
