Host powder saved my butt recently , i totally misread a dried in chimney Brest leak , a few square feet , i reckoned i could flush it out , damn stuff just kept coming no matter what ... and then started to spread like i was drawing more from the underlay ... i tried bonneting , that spread it even more . I soon had quarter the room light brown
luckily the lady was partially sighted and though the stain was gone .... but i couldn't leave it like that , her family would be back to me anyway .
So i told her i need it fully dry and il be passing in a few days . Returned and tried a quick bonnet ... just spread it again . Host powder and the crb ... was just the right tool to strip the brown from the top of the fibres without adding or spreading moisture . Turned out fine .
But generally i dont use it much , mainly because its fairly messy , gets everywhere i find .