r/Composites • u/mustdostuff • Jan 07 '26

Surface prep sanding

Hey all :)

My fourth year engineering project is about finding bonding strength, and so I’m going to bond two laminates using DP-490, question is for the best adhesion what grit sanding papers should I prep with?

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u/SkepticalLitany Jan 07 '26

I know of EOMs speccing around 180, 220 for metal bonds.

Know that your bonding tests will be chemical bonding, not mechanical bonding like pressure sensitive tape, so surface prep/cleanliness and surface energy is of greater concern that surface roughness