If Honey Teak is applied 'thick' it (the base coats where the UV protection is) can last for upwards of 12 years, with just an every two year quick maintenance cost of 'clear' - in northern climates, a quick yearly clear coat in the tropics. Ultimately moisture will 'wick' through the wood and especially the scarfs and become blackish ... 10-12 years is about the limit. Expensive, but when you amortize the cost and time over 10+ years HT comes out as the 'cheapest' and most time efficient.
The clear can be flat wetsanded (2000 grit) then 'powerbuffed' with 3M Perfect-it to equate to an ultra-prime 'mega-yacht' quality varnish job. The 'flatter' you get the final clear coat the less need for 'maintenance' clear coating.
Semco does not tolerate well 'green sea water' coming aboard and will quickly 'thin' and need recoating. Usually after a long 'passage' you will need to do a quick coat. The good thing is that if needs to be stripped, because of the 'blotches' from green sea water, it is easily stripped with a mild solution of trisodiumphosphate (TSP) then bleached with oxalic acid. For aggressive long distance 'blue water' sailing, you can mix 1/3+ Semco, 1/3 Teak Wonder, 1/3 Thompsons WaterSeal (with 'carmel' tint) for a longer lasting mix and with little increase of 'slippy-ness' when wet. I prefer 'natural' Semco but "goldtone" has more pigment and does last much longer. With teak decks, and the price of teak now running $50/ board ft., .... such is an 'economy' of maintenance and replacement cost.
Teak Guard doesnt allow the teak to become wetted out by water and therefore is 'slippery' when wet ... almost to the same loss of 'wet footing' as Cetol or varnish, etc.
Semco allows some water to penetrate through the coating so the wet 'footing' remains quite good.