3M Primer 94 increases the bond strength of acrylic and rubber based adhesive tapes. Each pen contains .02fl. oz/.66ml liquid. Primer 94 is also available in a .47fl. oz/14ml convenient and reusable pen / marker with reversible tip and two flow widths of .100"/2.54mm (round tip) or .200"/5.08mm (chisel tip), search ASIN: B085BB4HNG. Pen / Marker is also available with 3M 4298 adhesion promoter detectable by UV light, search ASIN: B0953S3F5F. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.