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Moldmaking Problems and Solutions | |||||||||
 If All Did Not Go Well . . .What Can
You Do?• Remain Calm! • Contact Us - We can help you figure out where you might have gone wrong. • Try Again. Most Common Reasons For Unsuccessful Mold Making Attempts 1) Problem: Mold Rubber Did Not Cure At All . . . Still Liquid Or Gel-Like A) Wrong Mixing Proportions (Mix Ratio). For example, rubber was mixed 1A:1B by volume instead of the correct mix ratio of 2A:1B by weight. B) Did Not Use An Accurate Scale. Example: A bathroom scale was used to weigh A+B in- stead of an accurate gram scale or triple beam balance. C) Room Temperature Too Cold. Example: After pouring rubber at 4 p.m., heat in shop was turned off before leaving for the night. 2) Problem: Partial Cure (Soft Spots) A) Not Mixed Thoroughly Enough. B) Not Accurate Enough In Measuring A + B -- either by weight or by volume. C) Did Not “Pre-Mix” Either Part A or B (as directed by the technical bulletin). D) Model Was Not Properly Prepared (sealed and released) resulting in contamination that inhibited the cure of the rubber. 3) Problem: Mold Rubber Stuck To My Model A) Model Was Not Properly Sealed- Either the wrong sealer was used or not enough was applied to the model. B) Model Was Not Properly Released - Either the wrong release agent was applied, not enough was applied, or it was not applied properly (as directed). Sections of How to Make Molds and Castings Moldmaking Materials Moldmaking Process Moldmaking Problems and Solutions Other Pourable Mold Configurations And Techniques Making A Brush-on Rubber Mold Using Liquid Plastics Making A Hollow Casting Using 3-D Brush-On Mold Spraying Mold Rubber Mold Making Review
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