So I am doing my first real pre-preg tool.  The mould I had made for me has had issues........ loads of stress cracks appeared after only a couple of pulls.. Not looking for answers or reasons why that mould has had issues. I got so pissed off that I looked into a dozen different things and all I got was dizzy with each person giving me a different reason.  So I took one I had made and lacquered it to get a good finish and to remove some of the raised areas where the original stickers got left on the tank when it was moulded.  I put it back into the mould and have started to remake the mould using pre-preg carbon tooling. So far it seems to be working.. I have done the top section already and although I have not removed the section from the part the flange areas look perfect and if the rest of the mould comes out the same way I will be happy. Having had numerous quotes to remake the mould for me including a quote from the person who made it in the first place (he seems to feel it is other reasons and not his work that has caused the problem). I have bit the bullet with some Tooling from SHD. 

I will post updates as I go and hopefully in a few days will have a finished working full carbon pre-preg mould. 

coming along nicely mate, prepreg tooling is fun to work with on big projects

The guy who has been making my tooling so far is not so keen on it.... He tries to push me down wet lay tooling and his prices dont add up now when I mention material costs... the £2500 fuel tank mould was about £500 in material I seem to remember.. now I have done this and all bar the tank base has cost me about £400 in material his pricing seems to no longer match when I talk to him even though the end cost remained the same... lol..   I asked about some cover mould which he quoted me £250 for in glass tooling and £350 for carbon tooling.  A difference of £100.. I worked out in pre-preg the material cost would be £13 for the surface and about £35 for the backing giving a total of £48 for the materials..  1/4 sq/m of surface and about 1/2 sq/m of backing.. And that is being on the safe side...