Coatings Single Component Products TT-P-1952E - Waterborne traffic paint A-A-2886A - Solvent traffic paint Relatively simple application Plural Component Products Epoxy Paint Methyl-Methacrylate paint More complicated application More durable than conventional paints
Coatings TT-P-1952E (waterborne) is themost commonly used coating in the U.S. industry.
Coatings Properties of TT-P-1952EWaterborne paint was developed in response to the risingdemand for more environmentally friendly pavement markingproducts. Low VOC (volatile organic compound). Durable when applied properly. Simple to clean up with water. Excellent glass bead retention. Highly visible colors. Type I – dries in 10-15 minutes under 85% humidity. Type II – fast dry (less than 5 minutes). Type III – is a high-build acrylic. Non-hazardous and non-flammable.
Coatings General Precautions Waterborne paint cannot be used in galvanized, brass, aluminum, or steel equipment; stainless steel only. Paint must be prevented from freezing and should be stored between 50-90 F. Paint should not be thinned. Clean equipment after each use.
Coatings Application Conditions Application temperatures: - Air temperature should be 45-50 F and rising. - Surface temperature should be greater than 55 F, and 5 higher than the dew point. - Relative humidity should be less than 85% (or expect longer dry times. - Heating or painting above 110 F is not recommended. Surface must be visually dry. Do not paint in windy conditions, unless windscreens are used. Material coverage varies due to equipment speed, surface porosity, and material viscosity.
Coatings Common Problems Discoloration (iron staining) from iron present in soil and/or pavement aggregate. Bleed through of asphalt into white paint makes the paint appear brown. A primer coat (200-250 SF/gal) seals the oils from the coating. Flaking and peeling of new coating due to insufficient surface preparation. Paint bonds better to the asphalt than the asphalt does to itself, causing premature pavement deterioration.
Coatings Curing of CoatingsMarkings are cured when all the chemical reactions stop.That means all the water and solvents have evaporated. TheNo-track condition usually comes sooner. Paint temperature – the higher the temp, the faster the cure. Pavement temperature – the higher the temp, the faster the paint will cure. Humidity – the higher it is, the slower the cure. Wind speed – the higher the wind speed, the faster the paint will cure. Paint thickness – the thicker the paint, the slower the cure.
Coatings Intercoat Adhesion Intercoat Adhesion of waterborne traffic paints can be a problem if the application parameters and dry time recommendations are not followed.• For Fast Dry Waterborne paints, the minimum application temperature is 50°F and rising.• For Low Temperature Application Waterborne paints, the minimum application temperature is 35°F and rising.• For both paints, the temperature must be at least 5°F above the dew point and be maintained during the dry through.• First coat must be completely cured (24 hours) before application of a second coat or new layer.
Coatings Terminology of Marking Materials Solvents transport solid portions of the mixture (pigments, resins, fillers) during manufacture and application. Pigments are used to provide color, UV stability, wear resistance, and hiding. They are the most expensive ingredient in the paint. Fillers (or extenders) are relatively inexpensive, and are used to give paint its bulk and increase durability. Additives are used to prevent ingredients from settling and skinning in the container, as well as aid drying, disperse pigments, prevent freezing, adhesion, etc. Shelf Life is the usable period when the integrity of the paint is stable.
Coatings Compatibility of Coatings New coating must be compatible with existing coating.