Decide whether to specify waterborne or solvent-based traffic paint for a job, balancing VOC-limit compliance against cold-weather/humidity drying-time constraints.
domain: EPA Clean Air Act VOC rules (40 CFR 59 Subpart D) plus state DOT traffic-paint specifications · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Confirm the applicable VOC ceiling for the job's jurisdiction (150 g/L federal baseline, or a stricter regional limit such as SCAQMD's 100 g/L).
Note that waterborne acrylic traffic paints comply with these limits by formulation, while solvent-based products must rely on VOC-exempt solvents to qualify.
Check the forecasted temperature/humidity for the job window, since solvent-based paints are sometimes preferred for shoulder-season or high-humidity conditions where waterborne cure times suffer.
Check the relevant state DOT's traffic-paint specification (commonly built on Federal Spec TT-P-1952, currently Revision F) for which type is required or restricted on that job.
Document the chosen paint type and its VOC-compliance basis in the job file.
Known gotchas
A solvent-based paint's VOC compliance depends on its specific exempt-solvent formulation, not the 'solvent-based' label alone — verify the SDS rather than assuming.
State DOT preferences and local air-district VOC rules can conflict (a DOT may favor solvent-based paint for cold-weather cure while the local VOC limit effectively forces waterborne) — check both before bidding.
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