I have been plastering for over ten years and over the past year I have developed a problem when skimming. When I skiiim stripes begin to appear and it takes a great effort to get them out and resort to skimming side ways. I am not doing anything differently. Has anyone else experianced this?
I have not had this problem or heard about it from anyone else. When you say 'stripes' do you actually mean just colour shading or is there an actual difference in texture or flatness? if so all I can suggest is to let the 1st coat firm up sufficiently so that it can be flattened off totally. Then when applying the 2nd coat keep it nice and thin and plenty of pressure on the front of the trowel to ensure the join to the previous section is kept flat.
I have to say I am quite intrigued now to find out exactly what the problem is, so would be good to hear back from you your thoughts regarding my suggestion.