Thanks again for your call on painting over existing sewn in white lines with a green color. This particular customer had a existing football turf field donated for new use as a baseball field.
We would suggest two possible solutions.
1) Aerosol paint
with a clear coat (primer) followed by a turf green colored aerosol paint. $65.00 per case plus $16.95, ships within 3-5 days with 3 day delivery.
This product can be applied using a traditional aerosol liner striper
2) Bulk latex paint, our TrailBlazer Solar Trail Green Sweep. $260.00 per 5-gallon pail plus $30 shipping and handling per pail. This product is in stock and ships within 2-3 days with 2 day delivery.http://www.athleticfieldmarker.com/products-field-striping-equipment-paint-stencils-tarps-tools/sports-field-athletic-marking-paint/trailblazer-solar-trail-permanent-turf-paint-custom-colors-5-gallons.html
This product should be applied using an airless paint sprayer
that generates at least 1000 psi, higher is preferred.
Also to help delineate the "skinned area" of the infield we now offer a 'dirt colored turf paint'. This is a non-diluted bulk latex product specifically formulated for synthetic turf. Pricing is the same as the Solar Trail Green Sweep product.