Teak needs some work
Clean with teak cleaner, sand and wipe with acetone. Then try one of these: I really suggest Cetol (made by Sikkens.) Follow directions on can. orDon Casey Tip #37 Varnish Coating Schedule for Exterior Brightwork The following coating schedule for applying varnish is offered as guidance, not gospel, but following it will nearly always yield a head-turning finish. Coat 1: Thin about 50% with the specified thinner. This is the sealer coat. Allow to dry overnight. Coat 2: Thin 20% with specified thinner. Do not sand sealer coat before applying coat 2. Let dry 24 hours. Coat 3: Thin 10%. Apply over coat 2 without sanding. Let dry 24 hours. Coat 4: Sand coat 3 lightly with 220-grit paper. Apply varnish full strength. Allow to dry for at least two nights. Coats 5 & 6: Same as coat 4 except sand between coats more heavily to “plane” the surface smooth. Flat surfaces may be sanded with an orbital sander. Coats 7, 8, and 9: Sand by hand with 320-grit paper between coats. Apply varnish full strength, taking extra care to avoid runs and sags. Allow each application to dry over at least three nights before overcoating. Coats 1 through 6 can be your finish varnish or a less expensive formulation, but do not use hardware store varnish. General-purpose varnishes are typically too brittle for marine use. In hot weather coats 4 through 9 may require a small amount of thinner to keep the brush from “dragging.”