Adblocker — PCSO
La Brea Avenue, Los Angeles, September–November 2025
Background
Illegal flyposting is the unauthorized posting of printed advertisements on someone else’s surface. Unlike legal flyposting, the walls are not cleaned; sheets pile up and become an eyesore. In Los Angeles it is put up on boarded and vacant buildings without the owner’s permission. Club promoters, small tours, and streetwear drops pay crews to hit those faces at night. Paste in a bag, sheets in a satchel, no name on the crew. A wall that already holds paper is a proven wall. Overposting is both advertising and a claim on the corridor. La Brea between Fairfax and Hollywood is one of those corridors. The same hours and the same plywood overlap with graffiti. The name on the sheet is what the city can fine. The crew is gone by morning.
"Adblocker" is the name used here for the removal of illegal flyposters from boarded buildings and the reclaiming of that surface. The wall is stripped. 2x4 boards are set in construction adhesive and then fixed with deck screws so that taking the timber off is difficult. Paste will not bond to the new face. Screws run through to the backside. The heads sit on the front so that any later sheet is pierced.
This documents the first Adblocker, “PCSO”.
Installation Phase 1
The letters went onto a face that still held paper. I mounted four 2x4 letters with construction adhesive and deck screws at 11 p.m. A ladder and a construction vest were on site. A police car pulled up during installation, said nothing, and went to a car parked in front of me.
Reaction 1
Three weeks later the letters were removed and posters were up again.
Installation Phase 2
I waited a couple of weeks and took down their posters all the way to the MDF and put up a new set of letters and used a stronger grade construction adhesive. This time I used larger-gauge carbon screws to fix it and additional screws driven from the back so the tips stood out from the face and would pierce any sheet pasted over them. I put adhesive in the screw heads as well.
Reaction 2
About a week later the face was tagged in white. The lines included “GET BEAT UP” and “STAY OFF OUR WALLS.” The PCSO letters were still in place.
Reaction 3
The building owner then painted the wall white, including existing lettering that read HOPES above the timber, and left the PCSO bars gold. The bars have remained that way for a year.
Lens
Illegal flyposting is unsanctioned plaque. Legal ads sit on a face the brain has sold; T-cells protect that face. The crew that keeps this wall in use are vigilante cells. They enforce a claim the city never gave them because the deposit is inventory.
Adblocker is an endarterectomy with a patch: strip the deposit, replace the face so paste cannot take. The first graft could be cut away. The second, carbon instead of steel, held.
The police car during the first install is the official T-cell. A ladder and a vest on a boarded wall at eleven looked like ordinary night work. The unit declined to classify the graft as a threat. The later warning was not from that line. It was cell-to-cell, from the same vigilante depositors who had been using the wall, directed at the cell that closed the face.
Conclusion
Adblocker is effective against illegal flyposting because the crews do not have the law behind them. Written threats of violence were a failed deterrent. They put the owner in a position to cover the wall. He painted the face white and left the PCSO bars. The bars are still there.
Glossary
Ad blocker. Permanent treatment of a posting wall. The surface is stripped and replaced so paste cannot take.
Fly posting. Unauthorized paper advertisements pasted to a wall. The deposit this wall kept receiving.
Plaque. Advertising occupying the vessel wall. Here, unsanctioned.
Deposit. What plaque leaves on the face. Sheets stacked on plywood.
Face. The printable skin of the wall. Paper, then MDF, then paint.
Paste. Wheatpaste. The adhesive that holds a poster to the wall, and the act of putting it there.
Endarterectomy. Removal of the lining that collected plaque. The wall stripped to board.
Patch / graft. The replacement surface. Timber locked on so the deposit cannot return.
Bars. The 2x4 letters that occupy the wall after the skin is gone.
Unsanctioned. Installed without permission. The first night used a ladder and a vest. No nameplate.
Vigilante. A cell that polices a wall the city did not give them. The warning on the second graft came from that line.
T-cell. Police. The car that stopped, said nothing, and left.