Repair Polyurethane mold or just start over?

[tubachris85x]

I had created a two-part mold in polyurethane awhile ago. The model I had molded had a deep undercut which I thought I had smoothed out. Well, while I was able to demold it, a portion of the undercut that I just missed snagged the rubber. I was able to take it out without much damage, no hole even formed at that time. I was then able to produce two castings, however, the 2nd on is where a large tear/hold was created when de-molding.

I found this material called "Ure-Bond" URE-BOND™ II Urethane Adhesive | Reynolds Advanced Materials

States that it's best for small tears and such and not for long term. Is there any other techniques for repair? I'd hate to scrap the entire mold for this.

 

[robstyle]

ive seen all sorts of quick fixes but its always going to be the inherent weak point so it will happen again. Fish tank repair silicone thats quick setting is the cheapest method if the original silicone will not bond to the old silicone as if gluing the two parts together with silicone.

 

[tubachris85x]

ive seen all sorts of quick fixes but its always going to be the inherent weak point so it will happen again. Fish tank repair silicone thats quick setting is the cheapest method if the original silicone will not bond to the old silicone as if gluing the two parts together with silicone.

Oy, if it weren't polyurethane. Sucks. Maybe I can do it better next time around then