Ipe Oil® penetrates deep into the wood grain to defend from within. It is not a surface film that will bubble, crack, or peel. No major sanding or stripping should be needed. Any hardwood which is left to discolor to a silver patina gray after coating, can be effortlessly restored to a gorgeous natural timber look even after many years of weathering.
While Ipe Oil® contains linseed oil, it also contains a fungicide, and that fungicide inhibits the growth of fungus (i.e. mold and mildew) on the surface of the wood coating. This material is in the product to inhibit the growth of fungus on the surface of the coating, not to kill any existing growth, and not to prevent the growth on the wood itself. Note: it does not kill existing fungus/mildew, or is it a "preservative".
A very important objective with any exterior hardwood oil finish is to make sure the surface is clean and dry before application. This will go a long way towards reducing the likelihood of any mildew growth on the wood surface. As fungicides are only designed to inhibit the growth of mildew in the stain. We highly suggest properly cleaning the wood surface to kill existing spores that may be on the wood before applying.
*Coverage on dense hardwoods