Taping for straight lines?

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Hang on Studio Wall
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Can anyone give advice on how to paint guitar strings - I've tried masking tape and painting along the edge of a piece of card but the results are never very satisfactory.
Was about to suggest card...have you tried a plastic  cash  card.  ...a redundant one.  You can cut then to different sizes.
A no:0 loaded rigger brush with a very steady hand along a bevelled straight edge rule - it can be done but I couldn’t do it I doubt!
Russell, have you got a ruling pen?  These can be used with diluted paint and give a very straight line when used with a ruler - and the width of the nib can be adjusted for the thickness of line you want.
Of course! A ruling pen… perfect so why didn’t I think of that! Some makes aren’t up to the job, I believe it was a Jaxell make that I bought which was useless. I’ve got an old technical drawing set with two different sizes in it, superb quality ruling pens, slim and thin so the paint or ink flows out without blobbing.
I presume you're using oils Russell. So long as you let the underneath dry you could paint a board stroke to cover all the strings and use the edge of a piece of card or silicone tool to remove the gaps in between the strings. I did the string bag of onions in my gallery like this. The net had two strands, I painted one stroke and then divided the stroke with a colour shaper. I did some small dots once with a precision bottle, the hardest thing was getting the oil paint in the bottle, you need quite a bit of medium. I only used one of them you can have some if you want to try, I'll post to you.  
Thank you Sylvia, Alan, Jenny and Collette for your tips and advice, I shall certainly look into a 'ruling pen' and I shall try your method too Collette, thanks again everyone.
Just a thought… ruling pens work well on a flat absorbent or semi-absorbent surface such as say cartridge paper etc. I am less confident about how they will react over a dried oil paint surface… I can easily see it blobbing. They were never the easiest tool to use, I’ve used them in my role as a graphic designer of course, pre-computer days. I do still occasionally use them to create a line and wash finish on a watercolour mount, tricky but worth it to see the end result. If you are thinking about getting one Russell, let me see it before you buy, some are pure rubbish and shouldn’t be on the market! I can tell at a glance if it’s up to the task!
Thanks everyone, really appreciate all the insight. :) 
I use Frog tape also (yellow or green). I paint the sides of my stretch and box canvasses, as I hate them left white. It looks messy and unfinished to me.
Helen Martell on 28/04/2023 00:14:34
What colour do you paint them Helen? One of the colours in the painting? Something else?
Sandra Kennedy on 28/04/2023 07:25:40
Depends on the main picture, Sandra. Mostly a contrast colour to the painting, but sometime a continuation of the painting. I tend to paint the sides either first (if intending to be a single colour), or mid-way through the main picture. Once (bone) dry, cover with masking / frog tape, then continue with the painting.

Edited
by Helen Martell

Have deleted my post.  Methinks this silly old bat is on a different wave length from everyone else.....

Edited
by Sylvia Evans

I regularly have to apply straight lines in my railway pictures....for black I use an ordinary permanent marker pen such as a laundry marker, for colours and white gel pens bought from Amazon. Materials don't need to be complicated and these work perfectly well; my pictures are all acrylic on canvas. I put books under the canvas to keep it flat and level while drawing on it, it needs the support underneath. I have also used Tamiya acrylic paint as sold to model builders very successfully, it's much thinner than artists acrylic and flows beautifully.  This picture illustrates it....yellow gel pan for the lining on the loco, black marker for the rails with white and blue highlights. The loco handrails are white gel pen too as is the front number.
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