Every plastic fabricator shall have a lien dependent on possession on any die, mold, form or pattern in his possession belonging to the customer for the amount due from such customer for plastic fabrication work performed upon the die, mold, form or pattern. A plastic fabricator may retain possession of the die, mold, form or pattern until such amount due is paid or until such time as^* the customer has posted with the clerk of the circuit court of the county in which the mold is located a bond in an amount equal to the amount in dispute. Such lien shall have priority over any other unperfected security interest or right in or to the mold, die, form or pattern.