Duralac insulating/sealant plastic helps prevent electrolytic corrosion on jointing points between two different metals such as: light alloy fixed onto stainless steel screws, light alloy windlasses or brass fixed with stainless steel bolts, stainless steel accessories for mast fixed onto the mast itself (made of light alloy) with rivets or screws, bollards coupled with different metal studs. Duralac is a yellow plastic based with barium chromate, flexible and resistant, to be fitted in between two metals that are jointed together; application with brush; do not dilute. 250 ml.