[Ged]

was watching our council removing graffitti from a river slipway. got talking to the guys, they were using calcium carbonate abrassive with a cold water pressure system. the operator reckons it removes gum, graffitti and everything exept hard dried on gloss paint. they had a 1000l bowser and a unit that delivered up to 1000bar. they were towing what i assumed was either a generator or compressor. they were using it at 200 and it was really shifting the graffitti. just wondered if anyone had used this method for domestic work and what sort of results.

Ged

[drive surgeon]

where do you get this stuff from? and how do you apply it, do you brush it on and then blast off?

[Ged]

 from what i could see it comes as a powder that is fed down a hose alongside the water high pressure hose and i assume it is mixed at the nozzle

[Kwackers]

They must use it through a dual lance

[Andy Foster]

This is an easy add on for your kit, it is just a sanblasting attachment available from most suppliers of pressure washing equipment.

Have used on graffiti, painted walls and even some realy thick limescale on a 10 year old wall.

Wouldn't normally use on graffiti as it will almost always pitt the surface of the wall.  Only time I have needed it was on some Hammerite which had been on for years.

Andy