Campervanannie
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I had a similar problem, Annie. When we're next together (Wellington, Stonehenge or Henley) I'll show you how I tackled my Moho joints. Some were renovated about 4 years ago, some about 2 years ago and some about a year ago. So far they all look OK.
Colin ???
The photo is good enough to show the problem. The sealant /filler is shrinking and needs replacement. First mask of the joint with two or three layers of masking tape to avoid damage to the bodywork either side. I would remove as much old sealant /filler as possible and deep enough for the replacement filler to get a good grip., if you are careful you can cut away the old filler with a craft knife or you may be able to just use a an old plastic peg or credit card or similar pice of plastic. The joint needs careful cleaning out to ensure no dust etc and I would refill it by injecting with Sikaflex 512 which is flexible and wont crack. To obtain a decent finish mask each side of the joint with clean masking tape so after you have used your mastic gun to inject the Sikalfex you can run a spatula or old credit card along the joint to give a smooth finish.It's not difficult but it is time consuming but you will do a better job than a dealer and you will know it has been dome thoroughly.