Spraying a two-part coating inside an occupied Berkeley home is regulated work, and the rules are not the ones a Southern California shop follows. The air rules here come from the Bay Area Air Quality Management District (BAAQMD) layered on top of the statewide California Air Resources Board (CARB) limits on volatile organic compounds. Diego Sanchez built the studio's product list and spray practice around those two regulators, because the right coating choice and the right containment are what let us finish a tub in your bathroom without leaving a problem behind. Below is the part of the job most refinishers never explain.
Low-VOC, CARB-compliant coatings — not whatever sprays cheapest
We spray acrylic-urethane topcoats formulated to meet California's VOC ceilings, the same low-VOC class CARB and BAAQMD push the trade toward. A lower-VOC product gasses off less solvent into the room while it cures, which matters when the bathroom sits feet from the rest of a Berkeley flat or a duplex's shared wall. The finish itself is identical in durability — the difference is what goes into the air, and that is exactly what the Bay Area regulator cares about. Picking the compliant chemistry on purpose is a small thing that a homeowner cannot see and a cut-rate quote quietly skips.
HVLP spray with real overspray capture
The coating goes on with a high-volume, low-pressure (HVLP) gun, which puts more material on the tub and less into the air than older high-pressure equipment — less waste, less drift, less mist escaping the work zone. Around that we run containment: the room is masked and sheeted, an exhaust fan moves air out a window, and the overspray that does lift is captured inside the tented zone rather than settling on your tile and floors. Controlled capture is both a quality step and a compliance step, and it is the visible half of what BAAQMD's rules are getting at.
EPA RRP lead-safe work in pre-1978 Berkeley homes
A large share of Berkeley's housing predates 1978, which is the line the federal Lead Renovation, Repair and Painting rule (EPA RRP, 40 CFR Part 745) draws. Where our prep would disturb old painted surfaces in a pre-1978 home — most often a clawfoot tub's painted exterior — we work lead-safe: we test or assume lead, sheet off and contain the area, use wet methods instead of dry-sanding, clean up with a HEPA vacuum, and bag the debris properly rather than sweeping chips into the trash. The interior bathing surface you actually touch is baked enamel, never the lead concern; it is the old exterior paint that has to be handled by the rule. Diego trained in these practices specifically for Berkeley's pre-war stock.
Isocyanate cure, Prop 65, and why DIY kits are riskier here
A two-part acrylic-urethane cures through isocyanate chemistry — the reaction that turns liquid coating into a hard, bonded film over 24–48 hours. Uncured isocyanates are a respiratory sensitizer, and they fall under California's Proposition 65 warning list, which is why our crew sprays in supplied-air or proper organic-vapor respirators with the room ventilated, then keeps you out of the space until the finish has cured and the air has cleared. This is the real reason a hardware-store DIY kit is riskier than it looks: a homeowner rolling or spraying one in an unventilated bathroom, with no respirator and no containment, is exposed to the same chemistry we manage with equipment and training. We do this every working day; it is not a one-time gamble.
Berkeley Tub Reglazing StudioEst. 2014 · Berkeley, CA
