Can I use your Rust-Oleum Mathys Fillcoat Fibres to cover a poorly finished render on my chimney? Such things as trowel marks and general scuffing from poor workmanship.
This product is designed for waterproofing of flat roofs and gutters, it is not a decorative paint.
For this application depending on the finish of the render, assuming it is cement based you could consider Rust-Oleum Mathys Murfill Quartz to address small surface uneveness.
It provides a textured, waterproof surface coating to exterior walls and façades.
This can be overpainted with water based paints.