Anti-graffiti Coatings for Exterior Granite

Archive of Older Topics Archive - Product Discussions #5
1

Hello all:

I am looking for an anti-graffiti coating product that can be used on exterior granite and is suitable for horizontal applications. It is for a seat wall at a high school. The only products I have at my finger tips are for porous/clay masonry wall surfaces. I spoke with PROSOCO this morning and they said they do not make a suitable product. Does anyone have a recommendation? The wall has been built and has already been tagged, nothing was specified alas.

2

Cynie,

Have you asked our friends Mike Woessner and Greg Pope for a Tnemec product?
This recently came up for an exterior wall at the ISGM addition, facing the MassArt building. I recommended they commission a graffiti artist now, but Piano’s office wanted it pristine. Don’t know what they selected.

3

Thanks Lisa. I will check with Mike.

4

You might check with your Sherwin Williams rep regarding their Anti-Graffiti Coating B97C00150.

5

I am still searching for a product that is suitable for horizontal surfaces of exterior granite - Tnemec Tehnical Services has not gotten back to me yet, Sherwin-Williams said Anti-Graffiti Coating B97C00150 will not stick to granite. Maybe a stone floor sealer would work? On another note MasterFormat has anti-graffiti coatings in divsion 9. We have them in division 4. Who would typically apply these - painter or mason?

6

To complicate matters, some water-repellant products (specified in Divisoin 07) have anti-graffiti properties. Horzontal surfaces? What kind? Traffic or non-traffic?

7

Seat wall at a high school. Most definitely Traffic.

8

Sinak (www.sinak.com) used to have an anti-graffit product that was sacrificial; build-up several layers and removing a layer would remove the graffiti. Additional layers would then need to be re-applied. At the very least I would consider seeing if their HLQ-125 could be used as a permanent ‘seal’. The HLQ (hydrolyzed lithium quartz) is a clear, chemically reactive product that densifies most concrete and masonry materials which helps prevent ‘tags’ from penetrating the surfaces and which can also help prevent ghosting when removal is necessary.

No matter what you use, require several test mockups, tag them, and remove the graffiti. It’s very difficult to avoid getting ghosting from the graffiti removal when using non-sacrificial treatments. The problem with sacrificial treatments is that they are generally non-vapor permeable and they can possibly affect the finished appearance (ie: turns polished finishes cloudy). The may also look different when wet (milky) as some are actually wax based.