I have made several items that will be placed around my small waterfall/fish pond. They will not be submerged directly into the pond pool or waterfall stream. They are however, placed close to the pond, on surrounding rocks that will get rained on and when I water the surrounding plant life these will get wet and create run-off into the pond. I am looking for a spray on aerosol, rather than a brush on application. Any info or suggestions would be most appreciated