 Main character heads were initially sculpted in either Plasticine or clay . Once the general aspect had been finalised , this served as the template for a silicone rubber mould . This was coated with Bondaglass ( fibreglass mixed with resin ) and enhanced with Bondapaste , a putty @-@ like substance , to accentuate contours . The Bondaglass shell was then fitted with a solenoid , leather mouth parts and plastic eyes , as well as incisor teeth – a first for a Supermarionation production . Puppets known as " revamps " , which had plastic heads , portrayed the supporting characters . These marionettes started their working lives with only a mouth and eyes ; their faces were remoulded from one episode to the next . Particularly striking revamp moulds were retained and , as their numbers increased , photographed to compile an internal casting directory . 
 Main character heads <a href='uninflect' title='1'><mark>were</mark></a> initially sculpted in either Plasticine or clay . Once the general aspect <a href='been_done' title='2'><mark>had</mark></a> been finalised , this served as the template for a silicone rubber mould . This was coated with Bondaglass ( fibreglass mixed with resin ) and enhanced with Bondapaste , a putty @-@ like substance , to accentuate contours . The Bondaglass shell was then fitted with a solenoid , leather mouth parts and plastic eyes , as well as incisor teeth – a first for a Supermarionation production . Puppets known as " revamps " , which had plastic heads , portrayed the supporting characters . These marionettes started their working lives with only a mouth and eyes ; their faces <a href='uninflect' title='3'><mark>were</mark></a> remoulded from one episode to the next . Particularly striking revamp moulds <a href='uninflect' title='4'><mark>were</mark></a> retained and , as their numbers increased , photographed to compile an internal casting directory . 
Main character heads was initially sculpted in either Plasticine or clay . Once the general aspect done been finalised , this served as da template for a silicone rubber mould . This was coated witt Bondaglass ( fibreglass mixed with resin ) and enhanced with Bondapaste , a putty @-@ like substance , to accentuate contours . The Bondaglass shell was then fitted with a solenoid , leather mouth parts and plastic eyes , as well as incisor teeth – a first fa a Supermarionation production . Puppets known as " revamps " , which had plastic heads , portrayed the supporting characters . These marionettes started their workin lives wid only a mouth and eyes ; their faces was remoulded from one episode to the nxt . Particularly striking revamp moulds was retained and , as their numbers increased , photographed to compile an internal casting directory .