ITEM 642  TRAFFIC PAINT

642.01   Description
642.02   Materials
642.03   Equipment
642.04   Application
642.05   Basis of Payment

642.01  Description.  This work consists of furnishing and applying alkyd or water-based traffic paint according to Item 641, 740.02, 740.09, and the additional requirements specified below.

642.02  Materials.  Furnish materials from the Department’s Prequalified List conforming to:

642.03  Equipment.  Use equipment capable of applying the traffic paint as recommended by the manufacturer and applying glass beads at the time of line placement.  Use marking equipment capable of applying traffic paint at the specified thickness at a speed of not less than 10 miles per hour (16 km/h).  Furnish a calibrated measuring device acceptable to the Engineer to measure the traffic paint in the striper tanks.

642.04  Application.  Apply pavement markings only when the surface is clean and dry, the pavement and ambient air temperature are 5 °F (2 °C) or more above the dew point, and the pavement and air temperature are above 40 °F (5 °C).  Transfer the entire contents of each paint container to the striper tank.  Keep the paint thoroughly mixed during application.

Apply paint at the following rates:

Increase the first application of paint to new asphalt pavement surfaces by 25 percent over the specified rate.

Do not dilute the paint.  However, the Contractor may add spent traffic paint solvents, generated during performance of this work, to virgin traffic paint.  If adding spent solvents, add them in a maximum ratio of 1:50 of spent solvents to virgin paint.  Ensure that the maximum concentration of spent solvents in the striping equipment tanks is 2 percent.  Add spent solvents during the loading of the striping equipment.

Use fast dry paint unless otherwise specified.

Apply glass beads to the wet paint so that the beads are embedded and retained in the paint and uniformly cover the paint surface.  Apply the glass beads at a rate of at least 6 pounds (0.7 kg) of glass beads per gallon (L) of paint applied.

Ensure that the temperature of fast dry paint at the discharge point is in within the range recommended by the paint manufacturer.

Apply, at the rates stated in 642.04, additional paint and beads to markings that were found to be more than 20 percent deficient.

642.05  Basis of Payment.  The Department will pay for accepted quantities at the contract prices, or prices adjusted according to 641.11, measured according to 641.12, with the provisions specified in 641.13, and as follows: