Thought I'd post this for anyone who fancies doing their own lug lining
Like most jobs, its much easier with the right tool! Its natural to assume lugs are painted with a brush, which they can be, but its much more difficult. The best tool for the job is a lining pen which you can find on Ebay for a couple of quid.
Humbrol enamel will work well with a lining pen (although, oddly, not very well with a brush). Adjust the pen so its a bit less than 1mm. Dip the pen about 6/7mm into the enamel, then wipe the excess paint off the back of the blades. Then do a little test on paper to get the paint moving. Its better with small amounts of paint loaded into the pen and line about 10/20mm each time as you work your way around the lug. If it goes totally wrong you can just wipe off and start again. If its not quite right you can correct it by going back over with the pen.
The pen has a flat blade and a curved blade, its best to have the flat blade against the lug, obviously the lug makes a natural guide for the pen. I do one side then turn the frame over and do the other. Some lugs are much easier than others and so are some colours. I like to make life difficult so I lug lined some Nervex lugs with red on black
Get the tunes on, open a bottle of whisky and take your time
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Load up the pen around 6/7mm deep
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Wipe off the excess paint from the back of the blades
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Test on some paper each time, sometimes it takes a couple of goes to get the paint moving
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On the seat lug I start in the 'V' of the lug and work outwards, then turn the frame, pick up the end of the line and work into the curve
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Any little mistakes can be removed with the end of a cocktail stick