Hi, thanks for your question regarding the Hobbytex Ball-Point Tips. We supply Tip Cleaner (1602 small & 1628 large) which is a thinners to help keep the nylon tips clean whilst using them. It is a white spirit. We suggest you wipe the tips clean after using them with a cloth dampened with the thinners, before storing the paints in an upright position with the tip pointing down. However, if the paints are very old, the spirit-based paint may have gone hard in the tip and it will be very hard to clean them. It is much better to simply replace the tips with new ones. If you unscrew the tip, and the paint flows freely, then they should work well with a new tip on them. Hope this helps, regards Jenny

Hi Dianne, thanks for your question. Yes the Hobbytex tips are designed to fit the old Artex paints. If you take off the old tip, squeeze a small amount of paint out to see if its still ok and simply screw in a new Hobbytex tip. Then, keep the tips wiped clean with a small amount of Tip Cleaner/thinners before you put away the paints after use.