Dowsil 791 External Weatherproofing Silicone Sealant 600ml - Black you will need to sand

you will need to sand it to remove loose wood and clean with white spirit

Finishing coat: Smooth planed hardwood and softwood such as trim

Unlike ordinary paints

Don’t try and get rid of it by sanding or any other means as this could spread the mould spores

It’ll be touch dry in 2 hours

Dowsil 791 External Weatherproofing Silicone Sealant 600ml - Black you will need to sandDOWSIL 791 Weatherproofing Sealant WEATHERSEALING & GLAZING SILICONE DOWSIL 791 Weatherproofing Silicone Sealant is a one part, low modulus, neutral curing weatherproofing silicone sealant designed for both commercial and domestic applications. It provides excellent unprimed adhesion to most porous and non porous surfaces. Product info Benefits Excellent weathering characteristics, including resistance to ozone, UV radiation and temperature extremes