or maybe putting down some membrane tape or similar, then throwing in some wood hardener and then using one of these wood putty solutions to bulk it out? If anyone has any good experience id love to know the products to use and process! Pics below, Cheers. Putting a slither of damp membrane tape or similar down on the base of the removed rot and then cutting a replacement piece of timber and wedging it in and filling it with wood filler and sanding and painting U-POL David's Isopon P38Bodyfiller Can be used on pretty much any surface of a vehicle from bare metal to Glass fibre panels. stevie22 - Do you have any experience of how far the ronseal hardener permeates into the wood? The further the better was all i was thinking, i dont want to remove much more of the rotten wood as i'd be breaking out towards making a hole through to outside through the external cill if i keep going. I'd say the wood is soft to the touch with force at the point i've scraped it out but not falling apart.

Does anyone know of a UPVC style coating that i could apply to the external cil if need be to give it more rain protection over weather paint?Looking at putting in a replacement to last us 18 months until were in a position to do exactly that.

This is a 2 component filler. Mix 100parts filler to 2parts hardener (Golf Ball of filler to a Pea of hardener)UK mainland Delivery is only available to postcodes within the mainland of the United Kingdom and excludes all islands such as Northern Ireland, Southern Ireland, Isle of Man, Isle of white and the Channel Islands. The rot is really only very bad up to what i've ripped out the rest seems fine. The installers have installed a damp membrane but not sure whether the membrane they put in is deep enough for the wood to rest on it and not touch the house foundations!