second base forming polymer 50 onto the surface of the mold roll or onto any of polymer 38 left on the surface of the roll by blade 44 a gear pump 36 48 is positioned at the outlet of each extruder to accurately control the rate of polymer delivered to the mold roll the final thickness of the base of the product is then adjusted by roll 52 rotating in the direction of arrow c and the finished fastener product 60 is stripped from the mold roll 40 by passing it around exit roll 54 for forming a fastener product having a relatively stretchable base and relatively stiff fastener elements a urethane may be employed for the hook forming polymer 38 and a rubber filled polyethylene or polyester based thermoplastic may be employed for the base forming polymer 50 an example of such a base forming material is arnitel em400 available from dsm examples of various fasteners that can be formed using the process shown in fig4 or modifications of this process are shown in fig5 5d fig5 shows a fastener 62 in which the hooks 64 are formed of a first polymer and the base 66 is formed of a second polymer using the process shown in fig4 such a fastener can be formed by scraping substantially all of the first polymer off of the surface of the mold roll prior to applying the second polymer fig5 a shows a fastener 68 in which the hooks 70 and the upper portion 72 of the base 74 are formed of a first polymer and.