Actually managed to get time to do the front screen today, and as Tricky had an interest I took loads of photo's, so hard luck to anyone else that gets bored.
This was the kit I used, cheapo stuff from the land of the virus. A velcro backing disk for the drill, 5 medium sanding pads, 5 fine pads, 2 fibre pads, a bottle of polishing paste and a water spray bottle.
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Before I started I thought it would be a good idea to use tape on the inside of the screen to limit the area I was working on, it would have been a really good idea to clean the inside as well, but like a plank I didn't think it all through properly.
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A close up of the problem
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Screen given the good news with the medium grit pad.
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Half screen finished with fine grit pad. To be honest if I was doing this again I would try and find a kit with a more aggresive first stage, not able to shift all marks.
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First half of screen after initial polishing with mop and paste.
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First half of screen finished off after initial polishing of second half, found that the polishing was most effective when just moist, rather than wet or dry, if you see what I mean.
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Overall quite happy with final finish, not perfect but much better than before. Total time spent actually with the drill, 4 hours, and for me it were hard work. Every now and then I felt it wise to let the screen cool down, and it really is important to clean all residue off the screen before starting the next step. The odd beer break was written into my contract before I started as well.