If they are a paint match to the white on the aircraft, they are most likely painted on. If they are an off-color get a magnifying glass and look close at the edge of one of the numbers, you'll be able to tell if it is paint or vinyl clear coated over.
US Army 2nd/17th Air Cav 101st Airborn
A&P, Commercial & Instrument Pilot
Airplane Multi & Single Engine Land
Helicopters (UH1's, AH1's, S76, H269)
Test Pilot (Military)
Long EZ Driver but love RV's
Dues Paid 5/18.