This presentation scopes different type of anti-graffiti coatings, performance criteria and standards which the coating should conform with

1. Presented by :
ZF Czora , ChE, ATSC

2. What is Graffiti?
- Is an unauthorised and
deliberate defacement of surface
or property using Heavy-duty
marking pens, paints, large
crayons, lipstick and just about
anything else that leaves a mark

3. • is a surface treatment or coating that is used in
graffiti-prone areas for the prevention of
permanent adhesion of graffiti to the substrate
and which aids efficient and easy removal of
graffiti.
• Available in clear where it is necessary to
maintain the natural appearance of surface
• And pigmented or coloured system – a dual
purpose of painting out graffiti and providing
subsequent protection
ANTI- GRAFFITI COATING

4. CLASSIFICATION
I. SACRIFICIAL:
- based on acrylate, biopolymers and waxes
- low sheen appearance but is visible on the
surface
- 2 coats required
- high pressure water cleaning (hot/cold) is
preferred
- exposure to chemical removal is limited
- needs recoating when graffiti is removed and
every 4 - 5 years or depending the durability of the
coating

5. II. Semi-Sacrificial:
- high build coatings
- usually based on acrylic either silicone
or PU modified or both
- shed/erode a few microns every removal
cycle
- further coats are reapplied to restore the
original appearance before the
coating is completely worn away,
- generally reapplied every 2nd removal
-using a combination of graffiti removal
solvent and high-pressure washer.

6. III. Non-Sacrificial ( Permanent)
- more expensive than sacrificial coatings,
but if used appropriately only have to be
applied once.
- can withstand several cycles of
defacement/cleaning before recoating is
necessary
- fall into two categories:
a. Penetrating/Impregnation
surface treatments
b. Permanent Film-forming

7. PENETRATING/IMPREGNATING
SURFACE TREATMENT
• Either water based or solvent based siloxanes
• Invisible low sheen appearance
• Maintaining the natural look of the substrate
• 1 coat required or depending on the porosity
of the substrate
• High pressure water cleaning is preferred
• Needs recoating after 5 cleaning cycles

8. PERMANENT FILM FORMING
• Usually two pack system – water based or
solvent-based where solvent-based is preferred
due to its durability and chemical resistance
• Either based on polyurethane, nanoparticles, or
fluorinated hydrocarbons
• Clear and pigmented
• Semi-gloss to high full gloss finish
• 2 coats required – recoating every 8 – 10 years
• Requires solvent type or water type graffiti
remover
• Requires experienced applicator

9. CLEANING METHODS
1. Abrasive methods – wet or dry sand blasting can be too
damaging to both treated and untreated substrate
2. Hot or cold high pressure water cleaning with or without
detergents
3. Heat – steam cleaning can be used to remove some paints but a
high level of expertise is required to ensure that volatiles are not
driven into porous concrete or masonry
4. Chemical removal –
-organic solvent blend soften, swell and partly dissolve the
marking medium and allow removal by cloth, brush, scrubbing with
water and detergent or low pressure water jet. Chemical removers
must be compatible with the associated anti-graffiti coatings.
- inorganic caustic based don’t breakdown the markings and
are not preferred

10. STANDARDS
1. AS1580.408.5 - Adhesion Pull Off Test
2. AS1580.602.3 – Boller Test
3. AS1627.1 – Cleaning using appropriate solvent, detergents followed by water
washing
4. ASTM D7089 – Cleanability Level 1 using water under low pressure (1200 psi)
5. AS1627.4 – Abrasive Blast Cleaning
6. APAS 1441 – Permanent Graffiti Barrier
7. APAS 1442 – Temporary Graffiti Barrier
8. APAS 1443 – Graffiti Remover
9. AS2700 – Standard colours
10. AS1580.108.2 - Dry film thickness
11. ASTM D4414.84 – Wet film thickness
12. ASTM D6132 – Dry film thickness using an Ultrasonic gauge
13. ASTM D4263.83 – Moisture in concrete by Plastic Sheet Method
14. AS3750.6 - Paints for steel structures Full gloss polyurethane ( Two-pack)
15. APAS 2911 – PU coatings for the protection of steel
16. VIC Roads Std. Specification Sec 685
17. Main Roads Specification 908 Anti- Graffiti

11. PERFORMANCE REQUIREMENTS
• Durability – non-yellowing & UV resistant
• Resistant to abrasion
• Resistant to graffiti remover
• Resistant to moisture condensation
• Early development of solvent resistance & film hardness
• Good adhesion - The applied coating system shall have an
adhesion value of greater than 0.75 MPa to the substrate in
accordance with AS 1580.408.5. (Main roads: 2.0MPa for
permanent; 0.25MPa for sacrificial)
• Shall pass a natural outdoor exposure of not less than 10
years (permanent)
• guaranteed ‘Graffiti Removal’ life of at least eight cycles of
defacement and removal from the date of application.
(permanent)
• Shall pass a natural outdoor exposure of not less than 5
years from date of exposure (sacrificial)

12. PERFORMANCE REQUIREMENTS
• The finished coating system shall have a minimum wet film
thickness of 175 μm and a minimum anti-graffiti coating dry
film thickness of 100 μm.
• Where an anti-graffiti coating is also used as an anti-
carbonation coating its minimum dry film thickness shall be
150 μm and shall also comply with the minimum performance
criteria as stated in Clause 685.18(a)(iii) for anti-carbonation
coating.
• The coating shall be impermeable to chlorides, water, carbon
dioxide and acid rain but shall allow the transmission of water
vapour (permeable to water vapour)
• Good anti-carbonation capabilities
• The applied coating system shall not have more than an “Oil”
gloss (Boller) panel 70, to AS 1580.602.3.

13. FOR ANTI-GRAFFITI COATING WITH
ANTI-CARBONATION CAPABILITIES
1. Equivalent Air Layer Thickness (R) - 150 metres
2. Equivalent Thickness of Concrete (Sc) - 450 mm
3. Co2 Diffusion Co-efficient (cm2/s) - 2 x 10-7
4. Water vapour equivalent air layer thickness (Sd)
of less than 4 metres
5. Dry film thickness of at least 150 μm (micron)
6. Water or acrylic based solvent free unless
otherwise approved by the Superintendent.
- Testing for items (1), (2), (3) and (4) shall be
based on the Klopfer Criteria for anti-carbonation
coatings and Ficks Law of Diffusion

14. NEW TECHNOLOGY
• One-component based on Moisture cure
polyorganosiloxane
• Permanent one-component silicone
elastomer anti-graffiti coating
• relatively high molecular weight
silicone ingredients react with moisture
under formation of the anti-graffiti
coating with an excellent adhesion to
the host surface.

15. APPLICATION
• PROVIDES PERMANENT PROTECTION AGAINST
GRAFFITI TO:
 Mineral substrates like concrete, brick, sandstone,
 Natural and artificial stones
 Plaster
 Wood
 Metal surfaces
• CAN BE APPLIED BY BRUSH, ROLLER AND
PROFFESIONAL SPRAY EQUIPMENT TO EXTERIOR
APPLICATION

16. KEY ATTRIBUTES
• Provides excellent release and ease of removal of most
permanent markers and aerosol paints
• As a concentrate, has the ability to adjust the active content and
viscosity to meet the needs of application
• Weatherproof and heat stable
• Water repellent (hydrophobic) and permeable to water vapour
(breathable)
• Enhances the colour of the surface and Pigmentable
• Sag Resistance and Flexible at low temperature
• Graffiti removal with cold water pressure cleaning of ̴100 bar w/o
additional cleaning detergents
• New graffiti can be removed by wiping off with water-soaked rag
• Contains no organotin cpds or oximes and is low solvent
formulation
• Primer not needed prior to coating application to most common
surfaces
• One-coat application is sufficient, multi-layer application possible

17. LIMITATIONS
Can only be thinned down with alipathic
hydrocarbon solvents
Speed of curing is dependent on the availability
of ambient moisture
Complete drying for heavier film builds may
require up to 24 hours
Containers, once opened, need to be used up
until empty
Application tools and equipment must
immediately be flushed with solvents to prevent
the coating from curing and forming a tough
adherent cured film.

18. GRAFFITI REMOVAL
AS CONCENTRATE AS 75% ACTIVE

19. WATER REPELLENCY
AS CONCENTRATE: AS 75% ACTIVE:

20. CONCLUSION
• The removability of graffiti depends on the
type of substrate surfaces and the chemical
composition of the marking materials
• Chemical removal and wet abrasive blasting
not only damage surfaces but also leaves
unsightly markings
• Anti-graffiti coatings are applied to expose
surfaces to facilitate subsequent removal of
graffiti preventing the deep penetration of
marking into pores & by preventing a firm
attachment of the markings to the surface

21. REFERENCES:
• VIC ROADS STD SPECIFICATION SEC. 685
• MAIN ROADS SPECIFICATION 908 ANTI
GRAFFITI
THANK YOU.
ZF CZORA ‘2017