FOLLOW US Primers are used to bond silicone used in the manufacture of the external prosthesis to the  acrylic baseplate which holds and supports the attachment mechanism. A-304 - Factor II General Purpose Primer 30g General purpose platinum curing silicone primer Works well with all acrylics A-330-G - Factor II Gold Primer 14g Primer for bonding platinum curing silicones to acrylics Improved bonding strength over A-304 PRIMERS A-330-G Gold Primer A-304 Factor 2 Platinum Primer G611 Platinum Primer