AI have just used some blue Renshaw colour melts in a variety of moulds including a ladies shoe approx 1 inch wide, button moulds and Wilton silicone and plastic letter moulds. I melted according to the instructions but had to add some oil as they were really thick and I couldn't pipe them into the moulds. I waited for them to set at room temperature and then refrigerated half and out half in the freezer.

When I tried to remove them from the moulds it was a disaster! The letters crumbled and all of the shapes were discoloured (they had a sort of blue/white speckled appearance). Has anyone got any tips on working with Renshaw melts? I have another 3 pots in different colours and would like to get better results next time!

My guess is that you may have over heated the melts.  It is very easy to do with 'white' based candy/chocolate.  If you used the microwave method, did you set the power setting to only 40-50%?  

AI had the microwave set to full power; I blindly followed the instructions on the pot of melts! I am going to have another try when I have a full day free to experiment with the power settings on my microwave. I am making some chocolate buttercreamand need to melt chocolate this evening and will use your tip about reducing the power. Thanks :D

AQuick update, the chocolate buttercream turned out great! So thanks again. Although currently wrestling with a pumpkin shaped cake. Have done a crumb coat and seriously considering covering it in fondant as the buttercream is driving me nuts! Think this may be the beginnings of a later post...