Thanks Graham. I used Blu-Tac and to be honest had no idea that it was oil based! I've never had any trouble with the residue that some people report however I don't leave it on for any longer than I have to. Once I've used it as a mask I don't use it for that again. The cleaner bits I will use again for other purposes,the really manky bits go in the bin. I always make sure my hands are really clean before rolling out the sausages. They aren't all exactly the same but I'd say about 2mm. This is for a fairly tight edge. I tear up
Tamiya tape to fill in,it always seems to rip on a curve which is helpful! You've got the width of the sausage to help you out so it's just a matter of making it fit,you can't rush and you need to try not to flatten the Blu-Tac too much.
Now for the story of the patch/repair behind the cockpit,clearly visible in the July '43 photo. Some say it is a fresh patch of Ocean Grey but it covers an area that should be dark Green. I think that if whoever applied it had the one camouflage colour to hand they would probably have the other and would have done it correctly. Based on this and knowing that the entire airframe was primed in a grey or grey green primer before painting I've decided that this area will be in the primer. I opted for a lightened RLM02 the Luftwaffe primer with which I am familiar.
It's come out like this.
In B+W it looks like this.
And that I can live with. There will be more about this area later. It's all to do with what they may have done and this affects aerials/antennae etc!
Cheers
Steve