Flyposting Glue and Shutter Tags on a London Shopfront: What Comes Off and What Needs Replacing

Get a thumbnail under a corner of it and pull upward. If a dry paper layer lifts and leaves behind a grey fibrous skin that goes soft when you breathe on it, you have wheatpaste and a good morning ahead of you. If the whole thing peels away in one rubbery sheet and leaves a clear tacky film, that is self-adhesive vinyl and the paper was never the problem. Those two answers lead to completely different jobs, different chemicals and, on a bad Victorian frontage in Peckham, a difference of about nine hundred pounds.

What is stuck to your shopfront, and what is it made of?

Three things end up on a London shopfront, and shop owners tend to treat them as one problem.

Flyposting is mostly still wheatpaste – flour, water, sometimes a splash of PVA to make it last through a wet week. Promoters use it because it costs nothing and goes up fast at two in the morning. Wheatpaste is water-soluble, which sounds like good news until it has spent three months soaking into unsealed brick, where the starch feeds algae and leaves a ghost visible from across Kentish Town Road.

Tags are aerosol, marker or etch. Aerosol on a modern powder-coated shutter is a straightforward job. Marker ink on old alkyd paint is not, because the solvent that lifts the ink lifts the paint underneath it. Etch is a different category entirely and I will come back to it.

The third thing is your own signage. Half the residue I get called out to look at in Dalston is the adhesive shadow left by a previous tenant’s vinyl fascia lettering, baked on for six years and framed by unfaded paint. Nobody vandalised anything.

The thumbnail test, and why it decides the chemistry

Wheatpaste wants water, heat and time. Vinyl adhesive wants a citrus-based or ester solvent gel and a plastic scraper. Contact adhesive – the stuff used to stick heavy laminated posters onto board hoardings – wants a longer dwell and a poultice if the substrate is porous. Use the wrong one and it costs you in both directions. Solvent on wheatpaste does very little except drive the starch deeper. Water on cured vinyl adhesive does nothing at all beyond wetting your sleeves.

How do you get the glue off without wrecking what is underneath?

Slowly, and from the least aggressive method upward. Warm water and a surfactant, dwell, agitate with a nylon brush, repeat. Most wheatpaste on a painted timber stall riser comes off this way in two passes.

When that fails, superheated low-pressure steam. A Doff or similar system runs hot water at low pressure and works on the bond rather than blasting the surface, which matters because half the shopfronts on the Seven Sisters Road are soft London stock brick and lime pointing that a 3000 psi lance will open up in about four seconds. Pressure washing a Victorian frontage to remove a poster for a drum and bass night is a poor trade – you spend fifty pounds on cleaning and create a damp path into the wall.

Why porous substrates hold the ghost

On Portland stone, York stone and unpainted brick, the visible poster is the easy half. Starch and any PVA in the paste wick into the pore structure, and once the paper is gone you get a lighter or darker rectangle that will still be there in a year. That needs a poultice – a clay or cellulose carrier, sepiolite or attapulgite, loaded with the appropriate solvent, applied thick, covered, left overnight and then removed dry as the carrier draws the residue out.

A poultice on a shop frontage is slow work, it is not cheap, and it is the point where I tell a fair number of callers to leave it. A faint square shadow two metres up on a Deptford High Street shopfront, above a fascia that gets repainted every four years anyway, is not worth six hundred pounds of specialist labour. If your frontage is painted masonry and a repaint is due within eighteen months, do not clean it chemically. That is a repaint.

Listed buildings and conservation areas change the calculation again. Abrasive or chemical cleaning of a listed shopfront can need consent, and I have turned down two jobs in the last year on that basis – both times on parades where the owner had no idea the frontage was listed. Ask the council’s conservation officer before anyone brings kit to site.

Will a tag come off a roller shutter, or are you repainting it?

This is the question I get asked most, and the honest answer depends on what the shutter is made of and what was sprayed on it. Four broad cases.

Powder-coated aluminium or steel, aerosol tag. Comes off. Powder coating is a cross-linked thermoset and it resists the solvents in a graffiti remover gel far better than the paint sitting on top of it. Gel, ten to fifteen minutes dwell, agitate, rinse, repeat on the heavier build-up where the can was held close. Expect faint shadowing where deep colours – reds, and the cheap fluorescent blues that everybody seems to be using in Hackney Wick this year – have stained the coating. On a dark shutter you will never see it.

Galvanised steel, unpainted. Also fine, usually easier, and the zinc coating tolerates the chemistry.

Site-painted shutter, alkyd or emulsion over galvanised. This is where the money goes. Air-dried paint applied by a decorator with a roller has nothing like the solvent resistance of a factory powder coat, so the remover takes tag and shutter finish off together and leaves you with a patchy grey shutter that looks worse than the tag did. That is a repaint.

Perforated or vision-slat shutters. Every hole is an edge that traps paint and every edge holds gel. Removal on a perforated shutter runs at roughly double the labour of a solid one, and residue in the perforations shows up as a dotted outline of the original tag in low sun.

The bit nobody thinks about until day two

The curtain has to come down. Half of a shutter’s surface is rolled up inside the box when the shop is open, so a tag that starts a metre off the ground continues onto slats you cannot see at trading hours. Book the work for a Sunday morning with the shutter closed, or you clean the visible eighty per cent and get a call on Monday evening asking why there is still paint on it.

Also check the guide rails and the bottom rail. Overspray collects in the channel, and rail paint gets ground into a smear every time the curtain runs.

What cannot be cleaned at all?

Acid etch on glass. Nothing brings it back.

Etch tagging uses ammonium bifluoride cream, sold as a glass frosting product and applied with a squeeze bottle. It bites into the surface within minutes and leaves a permanently frosted mark. Cerium oxide polishing lifts the shallowest of it and leaves optical distortion where you have taken depth out, which on a large pane reads worse than the tag did. Scored glass, done with a masonry bit or a broken spark plug, is the same story.

Which means replacement, at four figures for a single large toughened pane in a Brixton frontage, plus the day the shop spends boarded.

The film you should have fitted last year

Sacrificial anti-graffiti window film is optically clear polyester, four to six mil, applied to the inside face on residential glass and the outside face where the risk is etching. It gets etched instead of your glass. You peel it, you fit another one. It runs at a fraction of the cost of glass replacement per square metre, and on parades in Shepherd’s Bush and Walthamstow where the same three tags come back every few months it pays for itself inside a year.

The equivalent for masonry is a sacrificial wax coating – microcrystalline, removed with hot water at around ninety degrees along with whatever is stuck to it, then reapplied. I am much less keen on permanent fluorinated coatings on shopfronts. They cost several times as much, they can change the sheen of the substrate in a way that is very obvious on a matt-painted frontage, and if the tagging stops after a year you have paid for twenty.

Who is legally on the hook for getting it off?

You are, in most cases, which surprises people who assume the council owns the problem.

Flyposting is an offence under section 224 of the Town and Country Planning Act 1990, and the person physically pasting the poster can be issued a fixed penalty. That is enforcement against the flyposter, and it does nothing about the paper on your frontage. Separately, under sections 48 to 52 of the Anti-social Behaviour Act 2003, a council can serve a defacement removal notice on the person responsible for a defaced surface – anyone who owns, leases, occupies, controls, operates or maintains it – giving a minimum of 28 days to remove it. Ignore the notice and the authority can do the work and recover the cost from you. The regime was extended from graffiti to flyposting by the Clean Neighbourhoods and Environment Act 2005.

Some London boroughs will remove offensive or racist graffiti from private frontages free of charge and quickly. Almost none will remove a poster for a club night off your stall riser. Check your own borough’s policy rather than the one your mate in the next borough quoted at you, because they diverge sharply.

Read the lease before you read the by-law

Most commercial leases put shopfront repair and decoration squarely on the tenant, along with an obligation to keep the demised premises in good and substantial repair. The surveyor doing the terminal schedule of dilapidations in Camden will price the whole frontage rather than the square metre you ignored. That is a repaint, and it lands on you at exit valuation rather than at two hundred pounds a visit.

There is a related point on timing that cuts the other way. If you are eighteen months from lease end and the frontage is coming out anyway under a reinstatement clause, spend nothing beyond keeping it presentable. I have talked two tenants out of full removal packages on that basis this year.

The paste goes up again about three weeks after a good clean, on the same panel, usually a Tuesday.