Regarding using strips, should I cute them and lay them down adjacent to one another and then fill in the gaps with clay/putty and then finally cover in cling film perhaps before taking the mould off this? Obviously i will fillet the point where the cover meets the flange of the plug. Regarding filleting wax, I havent been able to find any where I am, will I be able to make the modelling clay work here or should I look for plasticine? MMM, wonder if my daughter play dough will react with the gelcoat