Blade,

Your orange paint doesn't meet the warning requirements in the law that purple paint does. It just shows the boundary of the property. Or like Jawbone said, it may mark trees to be cut.

So about all you can do is tell them to leave, and that will be their warning that your orange paint didn't give them.

The law defines the following form of indictment for trespassing:

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Section 15-8-150

(98) TRESPASS AFTER WARNING.

A. B., without legal cause or good excuse, entered into the dwelling house or on the premises of C. D., after having been warned within six months preceding not to do so; or, A. B., having entered into the dwelling house or on the premises of C. D., failed or refused, without legal cause or good excuse, to immediately leave upon being ordered or requested to do so by C. D., or the person in possession, his agent or representative.