Sadly too late but thanks for the advice .I had already done it .nothings happened so far .I did try replying yesterday but it seems to have disappeared into the web.Any idea how long this reaction will take .I have used Milliput on 3D print 009 locos to add lead and nothing has happened after quite a few months.at least its only 11 UKP down the drain .I first used Milliput in the early 70's for patterns and moulds etc and nothing has ever reacted with it so far but of course 3D print is a newish technology .time will tell the die is cast etc .....