Commercial bar tops are subjected to extreme wear and tear. the only products that we can confidently recommend for these conditions are Sadolin PV67 Heavy Duty Varnish and Manns Trade Bar Top Lacquer. Both are extremely durable but also extremely smelly during application, due to their high VOC content. Good ventilation is essential when applying these products.
Danish oil is perfectly fine for kitchen worktops as it's made from natural ingredients and is both food and child safe when dry. Dedicated worktop oils offer better durability, longevity and require less coats (typically 2 for new worktops or 1 for previously oiled worktops. They also require less maintenance than Danish Oils. Dedicated work top oils are also food and child safe when dry with some offering anti-bacterial properties. Worktop oils also tend to change the colour of the wooden worktops less than Danish Oils
The black stains around the taps and sink are likely to be mould spores in the work top as a result of prolonged water ingress in to the wood. If left untreated, this will ultimately lead to wood rot and decay. The affected areas should be sanded back to bare wood and treated with a mould and mildew cleaner such as Barrettine Mould and Mildew Cleaner, several applications may be required if the discoloration is bad. Once fully dried the whole worktop should be treated with a worktop oil to prevent further water ingress and future mould. For additional protection, a coat of Osmo Wood Protector (4006) can be applied prior to oiling. This product offers excellent water repellency.
In simple terms yes. This can be done by either applying a wood stain then sealing the stain in with a wood oil or varnish, or by using a pigmented or coloured wood oil such as Osmo Polyx Oil Tints or Fiddes Hard Wax Oil Tints, both of which are ideal for kitchen worktops, are food and child safe when dry and are easy to maintain and repair.
Varnish can be used on wooden worktops with some containing anti-bacterial properties. Our advice however is to use a worktop oil as they are easier to maintain and repair. Varnishes are fine all the while they remain intact. In kitchens however they are subjected to sharp objects that can break the seal between varnish and worktop allowing moisture penetration. Over time, this can lead to cracking, peeling and flaking, a situation that won't happen with a worktop oil.