efarley
Active Member
Hey,
First my question, does Urethane RTV rubber bound to itself aggressively enough that I can pour fresh rubber on top of cured rubber and have it form a one piece mold.
Now on to the details, I have been working on a sculpture which I was in the process of creating a mold. I choose Urethane RTV Rubber since it's the cheapest solution which is working great. However I have had my mold box fail twice now, the first time because I failed to seal it properly. The 2nd time, well I had the box completely filled with rubber than about 5 minutes later the weight of the rubber burst the side of my box open like a dam. I attempted to fill the holes with clay but the clay just instantly got coated in rubber preventing it from sticking to it's self and keep just falling off. After a while of attempting to save the mold I realized it couldn't be saved and threw it into a plastic bin to help keep the mess manageable.
Well the next day I checked on the mold and only about half of the rubber had poured out leaving the mold half complete. Because the mold box was filled before it started to leak the exposed portion of the mask has a thin coating of rubber capturing the details. Because the entire mask is coated in rubber and all of the details have been captured in that coating I think that I should be able to pour more rubber in to fill the rest of the box finishing the mold.
My concerns are that if the rubber doesn't bond to it's self aggressively enough I'll just end up with an unusable two piece mold that used nearly $300 worth of rubber to make. Also I can't afford to buy more rubber until next week which will mean the rubber I have poured will have fully cured before I can add more rubber to, so I'm worried that will prevent the rubber from bonding aggressively enough. I'd love to save this damned mold but I'm not willing to invest any more money into it unless I'm sure it wont be wasted since I've already lost $200 worth of rubber to this mistake.
Here are some pics of the aftermath:
First my question, does Urethane RTV rubber bound to itself aggressively enough that I can pour fresh rubber on top of cured rubber and have it form a one piece mold.
Now on to the details, I have been working on a sculpture which I was in the process of creating a mold. I choose Urethane RTV Rubber since it's the cheapest solution which is working great. However I have had my mold box fail twice now, the first time because I failed to seal it properly. The 2nd time, well I had the box completely filled with rubber than about 5 minutes later the weight of the rubber burst the side of my box open like a dam. I attempted to fill the holes with clay but the clay just instantly got coated in rubber preventing it from sticking to it's self and keep just falling off. After a while of attempting to save the mold I realized it couldn't be saved and threw it into a plastic bin to help keep the mess manageable.
Well the next day I checked on the mold and only about half of the rubber had poured out leaving the mold half complete. Because the mold box was filled before it started to leak the exposed portion of the mask has a thin coating of rubber capturing the details. Because the entire mask is coated in rubber and all of the details have been captured in that coating I think that I should be able to pour more rubber in to fill the rest of the box finishing the mold.
My concerns are that if the rubber doesn't bond to it's self aggressively enough I'll just end up with an unusable two piece mold that used nearly $300 worth of rubber to make. Also I can't afford to buy more rubber until next week which will mean the rubber I have poured will have fully cured before I can add more rubber to, so I'm worried that will prevent the rubber from bonding aggressively enough. I'd love to save this damned mold but I'm not willing to invest any more money into it unless I'm sure it wont be wasted since I've already lost $200 worth of rubber to this mistake.
Here are some pics of the aftermath:
