Figure 6. Can of oil and the corresponding mould in plastazote.
If it doesn’t form correctly first time then it is possible to put the plastazote back in the oven, heat it up and try again. However, each time you do this the plastazote becomes gradually thinner, so be aware of this. If you are only vacuum forming small objects then I found that it is possible to decrease the surface area of the vacformer using duct tape. This allows a smaller piece of plastazote to be used, so you are reducing waste, while still maintaining the seal (fig 7)