First time trying to inject 2 tone crappie bait with plastisol can not get plastic to flow through entire mold with blank plate installed. Sometimes 3 or 4 cavities will fill correctly I return plastisol to microwave then all pour but only half or 4th of cavity inconsistent it feels as though there should be an air relief to allow plastisol to inject smoothly I am pushing the plunger super hard and it does not seem to change try at least 10 times with no good results am I missing something simple or is the blank plate supposed to have air relief ? I might be to cautious as I do not want to burn material loses color when burnt. Any suggestions has any one expierienced this problem? Mold works great when not using blank.