The type of dye used to enhance the Tagua Nut is colorfast, washable and dry cleanable. Tagua Nut slices will benefit from a light polishing with Pledge or other fine wood care products. Spray a little Pledge onto a soft cloth and polish the slice with the sprayed cloth. Be sure to polish the entire pendant; front, back and sides. This should not change the appearance of the material but will add a light waterproof coating. You can re-apply the pledge when needed. Be aware that constant wear in water, especially chlorine water, may affect the color and durability of the Tagua Nut slice. The Tagua Nut is also similar in its make-up like that of wood, so when worn in the water, the Tagua Nut will absorb water and expand slightly in size. Rest assured, it will return to its original shape once fully dry. If you would like to glue anything to the Tagua Nut slice, you can do so with any glue that would work with wood (We liked GL527). Gluing items may not work very well with Tagua Nut slices that have been "waterproofed", however.