Fractured Axel

I know we've already looked at the superglue repair method for a torn sail - but in addition to that method I was wanting to get some feedback on the different repair tapes that you may have used...

Looking for the following comparisions:

Flexifoil Repair Tape
Mylar Repair Tape
Ripstop Nylon Repair Tape (coloured)

Looking at their 'invisibility' factor when the sail is patched and also the 'permanent' nature of the repair - Whether or not it'll last after the fact.

I have Halfords headlight repair tape on my Gemini that hasn't peeled at the edges in three years... It's not invisible though.