B
Benny
There is a pretty sprited discussion going on one of my other message boards about appropriate surface prep for epoxy primer. A guy who once worked as a a Tech Rep for BASF has stated that a blasted metal surface or an 80-grit metal surface it too rough for good epoxy adhesion. His recommendation is to effectively smooth out a blasted surface with a 180 or even 220 grit sanding, before applying epoxy.
He maintains that the epoxy adhesion relies on a combination of chemical and mechanical bonding, and that the primer will lie across the peaks, and create a terrible bond. I understood that epoxy used a purely mechanical bond to create adhesion, and that a blasted or 80-grit surface would be the ideal surface.
Is there any truth to his statements, and if not, what is the technical rebuttal to them?
Thank you
He maintains that the epoxy adhesion relies on a combination of chemical and mechanical bonding, and that the primer will lie across the peaks, and create a terrible bond. I understood that epoxy used a purely mechanical bond to create adhesion, and that a blasted or 80-grit surface would be the ideal surface.
Is there any truth to his statements, and if not, what is the technical rebuttal to them?
Thank you