I'm not sure what removable substance I can use that I can pick out without scratching the underlying paint. Someone else suggested I just spray on the dayglo stuff after I've done the base colour and then wipe the surface - so long as the wipe is flat enough it shouldn't drag the paint out of the indented letters. Not made my mind up yet.
Today I sanded it lightly, ran a tack cloth over it, and then added the dayglo bits.
First, the blue:
IMG_20171028_172349 by
duncancmartin, on Flickr
IMG_20171028_172400 by
duncancmartin, on Flickr
I left it a bit and then added the orange and the pink:
IMG_20171028_174647 by
duncancmartin, on Flickr
I put pink on the inside of the chain and seatstays, and orange down the back of the seat tube.
This all looks very bright and messy, but the idea is to wait until it's all dry, and mask it all up. There will be a 1cm width line down the middle top of the top tube and one a little bigger along the middle top of the down tube. Similarly the rear triangle will get masked up with thin tape on the inside of the chain and seat stays, and chunkier tape down the middle back of the seat tube. Hopefully, it will end up being relatively neat and subtle once the plum is on everywhere that's not masked.
I have 1 remaining issue - the original head badge is knackered. There are 2 holes in the head tube that I need to fill, either with a new badge, or with a plug. I need to think about hos I should do that. I guess I could leave the holes there and just use a sticker, but I'd rather use a neat head badge. Maybe I could just paint the original with the neon and then epoxy it on (the clips came off the back of the pins that go in the holes).