Organic AcetoneXyleneMEKProsoco tar and asphalt removerTag awayProsoco 1 ProSoCo’s Fast acting stripper or heavy duty paint stripperProsoco 2010Prosocoenviro stripsMethylene chloride containing strippersClay poulticeModify an AB57 gel recipe – marblePeel away 1 Peel awayPeel away 7 or 2Solvent based stripper Solvent poulticeHydrogen peroxide poulticeCalcium hypochloride poulticeSodium hydroxide gel Poultice or long dwell chemical stripper, if not work reapply chemical stripper – long dwell and scrub with a toothbrush – good for red and strong colored graffiti Soy GelSolvent gels bulked with cellulose fiber Zip Strip Rock MiracleCathedral Stone’s strippers – but not for granite
Marble samples cored from block of Colorado Yule MarbleYellow high fired modern brick: Glacier White from the PerlaEastgate plantLow fired historic red brick from Cane River Region
Complete Removal System is an environmentally safe method for removing up to 30+ coats of paint in a single application from most surfaces, (i.e., wood, brick, Concrete, stone, stucco, plaster, cast iron, steel, marble, and fiberglass).
Manufacturer states that the WipeOut is specifically formulated for use on porous surfaces and will not damage surfaces including brick, concrete, cement, pavers, stone and terrazzo.
Laser is the most efficient at removing black paint from marble, but it is ineffective at removing red paint from any sample. Also, alterations to the surface were observed. It is likely that brick samples were vitrified from the localized heat of the laser.Peel Away was most efficient at removing paint from all surfaces, based on color change.Wipeout performed well on the high fired brick samples. It mobilizes the paint pigments on porous materials.Sure Klean Fast Acting Stripper was less effective at removing paint from all surfaces.
The 30 nonbiased volunteers ranked the different cleaning techniques in each of the six groups: high-fired brick painted red, high-fired brick painted black, low-fired brick painted red, low-fired brick painted black, marble painted red, and marble painted black. The responses to the survey give the most accurate representation of which cleaning method best removed the paint, because ranking the cleaners represents the personal opinion of the general public. The poultice cleaner will likely be viewed as the best cleaner by the general public for marble and low-fired brick. The gel cleaner will be seen as the best on high-fired brick
A comparison of cleaning methods for graffiti removal from masonry materials B Y M A R Y F. S T R I E G E L , E R I C G U I D R Y, M O L LY M C G AT H , A N D C AT H E R I N E A R C E N E A U X N AT I O N A L C E N T E R F O R P R E S E R VAT I O N TECHNOLOGY AND TRAINING
What are important factors to consider before removing graffiti?
Graffiti or Art?The Polish city of Lodz is making huge waves in the street art world. Under thepatronage of Mayor Hanna Zdanowska … In MyModern Met website 9/29/2011
Type of graffiti materials Markers Spray paints Others
Weathering factors Sunlight = UV cross- linking or fading Temperature Humidity“Graffiti peeling – yellow” by Greig Christie, August 12, 2005. Flickr. Accessed 10/09/2011.
How do we evaluate graffiti removal methods? NCPTT study
What are people using to remove graffiti? Survey of Professionals: requests to conservators and preservation professionals in the field 20 responses received Most used chemical cleaners Organic Solvents: Acetone, MEK, Xylene Solvent poultices Solvent Gels Commercial Products Solvent based Hydroxide based Peel Away products
Selection of masonry types Marble Red, Low Fired Brick Beige, Modern Brick
Selection of Graffiti materials Type: Rust-oleum Enamel Color: Red, Black
Choice of cleaning systems Peel Away 1® Wipe Out Porous Surface Graffiti Remover® Sure Klean® Fast Acting Stripper Laser Cleaning
Peel Away 1® A poultice like paste containing caustic cleaners Active Ingredients Calcium Hydroxide Magnesium Hydroxide Sodium Hydroxide pH = 13 Requires a separate neutralizing solution
Improvement of Visual Appearance Percent Ranked #1 in Visual Appearance Survey1009080 Poultice7060 Laser5040 Stripper3020 Gel 10 0 H-F Brick Red H-F Brick Black L-F Brick Red L-F Brick Black Marble Red Marble Black
What have we learned?Of the products tested: Peel Away was most efficient for removing paint and the least physical damage to the surface, but it was difficult to remove from some surfaces Sure Klean Fast Acting Stripper was a gel that limited penetration into the material. It was a poor performer overall. Wipe Out was difficult to control during application and caused the relocation of pigment. It performed well on the high fired yellow brick. Laser ablation required a great deal of pre-experimental examination to be effective.
Where do we go from here? Limited study established methods for evaluating graffiti removers A greater range of products must be tested, with an emphasis on cleaners that are: Environmentally friendly Effective at removing a range of materials Safe for the cultural resource, the environment, and the user