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Paint - The blurg defeated

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MrDavo:
Right, I'm back from the Manx, no bike related dramas (only a health one - I came back with a swollen foot which turned out to be gout - possibly a result of a burger & beer diet) so I have now talen a dental pick to the bubble to see what was underneath.

Not a rust hole as I feared, but there seems to be filler there, I assume covering a ding, and there was a small crease in it, creating a small void which I guess trapped air that expanded with heat when left out in the sun, forcing up the bubble under the paint. So, down to poor preparation really, like the paint under the crank bearings, spoiling a thorough restoration with a tiny detail.



You can see how the silver coat hasnt stuck to what I presume is a white primer coat and how the bubble has then spread further, unsticking the blue candy from the silver. The 'crease' is top leeft of the white patch.

No sign of any fuel contamination from the inside, the tank seems to have been sealed in the past with POR15 or similar, it all looks to be a uniform smoth primer grey finish inside rather than the dirt and rust I feared I may find in a 46 year old tank.

I'm not sure who will get the job of painting yet, it may be a while before I get the time to remove the headlamp and ears. I may take it to my local auto bodyshop, who recently did a good invisible repair on my 911. One concern I have is shade - the candy colours darken with more paint, without a NOS bit of Candy Ruby Red it will be hard to tell him what to match it to. Either I look and ebay for a small new bit in that colour or a used bit with a patch that has never seen sunlight (Ive had red cars turn pink before and know what a bugger it is for fading in UV light), or maybe just give him a link to the red body kit on the Yamiya site and tell him that's what I want.

At Crich, Trigger told me my stripes aren't quite in the right place, but the paint kit from Andy Kepok has a scrap of paper with measurements, so I'll tell him to use these and not just put the stripes where they are now.

I'm not going to do anything to the bubble site, as it comes under paint preparation I will leave it to the professional to rectify it as he sees fit.

MrDavo:
I was a bit puzzled as to how there could be a 'crease' in the filler, but on closer inspection I think its a bad edge to a repair patch. I still find it incredidble that someone would think this OK, given that paint quality is all in the preperation, and wonder what sort of blemish would have been showing through before the bubble came up.

Anyhoo, after reading recommendations on here and other forums, I'm toying with the idea of using a specialist bike painter who has done candy before, rather than finding out the hard way whether my local chap is any good at it. Everyone thinks Andy Parnaby's jobs are the dog's danglies, and I don't mind paying a bit more to have it right the first time, especially after the fun and games I had trying to get a side panel done in candy blue green to a reasonable standard locally (3 different painters, the first of which was me, even then it wasn't perfect with dust in the laquer that had to be polished out). He seems to have moved to Wetherby since Ash and others used him in Tockwith, but I found a 2017 number and email for him on a Triumph triple forum.
 
I still don't know how you would paint candy without a sample to match for shade, but hje should have a better idea than my local car body shop of what we are after.

Bryanj:
Even with a sample its just about impossible to match candy as every pass of colour changes the shade, hence most will only paint sets

K2-K6:
One way of getting filler not sticking to a repair is by putting it onto non keyed gloss surface ie original paint. Sometimes with a small shallow dent the repairer deems it too small to hold enough filler to reprofile before priming, so they knock it in to a bigger dent prior to filling then fail to sand the surface properly.
I guess that given the approach you've found in the engine then anything is possible.

Trigger:
Bryan is right as, paint is my worse nightmare. I have known a painter to paint two tanks in candy with the same paint but, over  two day's. The first tank came out spot on, the second a day later was totally wrong.
Andy is a very good painter but, his prep is not to my preference.
Menno's prep work is the best I have ever seen, he soaks the tanks in acid which strips the inside and out. Then you have a good canvas to start work.

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