roughen the surfaces so they will stick to each other.
Examples of roughen
roughen
Before you paint, clean the surface, and sand glossy surfaces to roughen them up.
From the thenewstribune.com
Are you reluctant to take on manual labor that might roughen your hands and break your nails?
From the denverpost.com
Roughen up your patching a little if you want it to blend in.
From the smh.com.au
Drain the potatoes well then return to the pan and cover, shake the pan to roughen the edges of the potatoes.
From the expressandstar.com
The studs also roughen the ice, thus providing better friction between the ice and the soft rubber in winter tires.
From the en.wikipedia.org
Their first trick is to roughen the surface of the cartridge by dipping it in a solution of aluminium oxide and urea.
From the newscientist.com
To make handling possible, microscopic inert inorganic particles are usually embedded in the PET to roughen the surface of the film.
From the en.wikipedia.org
As a trumpeter, Akinmusire can roughen up his tone and make wide leaps like an avant-gardist, or play hollow notes like trumpet is just a piece of pipe.
From the npr.org
As the substrate deforms, the liquid flows within the pores, causing the smooth and defect-free surface to roughen through a continuous range of topographies.
From the nature.com
More examples
Make rough or rougher; "roughen the surfaces so they will stick to each other"
(roughened) chapped: used of skin roughened as a result of cold or exposure; "chapped lips"
(Roughening) A mechanical or chemical treatment of a surface to produce minute irregularities.