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Shopping list
Base colour paint - this is the colour you want the lines to be
Paint in the colours you want the shapes to be
Frog tape, yellow is best if you have recently painted the wall otherwise green is fine
A brush for every colour
Method
First you want to paint the wall in the colour you would like the lines between the shapes to be, I used white. You want to leave this over night at the very least before using tape or you will probably have a lot of patching up to do later.
I chose to only paint part of the walls in this style so what I did next was use the frog tape to mask off the area's I was I wanted then I pained the rest of the walls in the block colours I had chosen. I removed the frog tape while the paint was still wet and again I left this over night to dry.
Next I broke out the frog tape and stuck it all over the walls at random, I found taking a photo on my phone and looking at the photo made it easier to decide which bit's I liked and which to change.
This is the fun bit and why you need a brush for every colour rather than cleaning the same one between colours. Starting in a corner decide which colours you want where and mark them with a small splodge of paint. One colour at a time paint those shapes, as soon as you finish one colour start the next. As soon as you finish the first coat of the last colour start again on the second coat, do not leave it 4 hours between coats just get straight on it. As soon as you have finished the second coat pull the tape off, try to pull it out from the wall and not sideways to avoid the wet paint on the tape touching the wall. If you have a large area to do this on I would recommend painting in sections so that you can peel the tape while the paint is wet. As you can see from my photo's I used green frog tape on a freshly painted wall instead of the yellow I've advised you use here, at the time I didn't know the yellow tape existed but I do use the yellow now. By raven jane Carlton
Mosaic Walls, Using Frog Tape.