Convenient and easy to use valve action reversible tip. Dispenses 3M Primer 4298 in widths of either 0.100"/2.54mm (round tip) or 0.200"/5.08mm (chisel tip). Refill with 3M 4298 bottle 4oz/188ml (search ASIN: B082VMFCPT). Also available with 3M 94 adhesion promoter (search ASIN: B085BB4HNG). Helps increase the bond strength of acrylic and rubber based tapes. Especially helpful on Low Surface Energy (LSE) and Medium Surface Energy (MSE) substrates including common plastics used for automotive dash and interior trim applications (TPO, PPO, PP, PC, PC + ABS, etc). Clear light yellow primer and detectable by UV light, dries in approximately 30 seconds. Same ingredients as 3M 06396 except with detectable primer. 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.