Six JET divertor tiles were coated with tungsten marker stripes for erosion/deposition studies. The thickness of the coating was measured by profilometry and Rutherford Backscattering Spectrometry (RBS). The average thickness was 3.4mm and the film was uniform within 5% across and within 10% along the stripe. The major impurities were determined using time-of-flight elastic recoil detection analysis, particle induced X-ray emission, X-ray fluorescence spectrometry, RBS and secondary ion mass spectrometry. Small amounts of C, Fe, Ni and Cr were found. The in-plane stress was determined by X-ray diffraction peak shift. Resistance to high heat loads was tested in the Neutral Beam Test-bed at JET. A coated carbon fibre composite block was exposed to a total of 113 pulses with a maximum peak power density of 15.7MWm-2. At this power density the surface temperature went up to 1280oC. No visible changes as a result of thermal cycling nor sputtering of the film by deuterium could be detected. RBS spectra along the sample, taken before and after the NB tests were compared and found to be nearly identical.