GPc surfaces are made from a woven polyester taffeta, laminated to a BOPET film (Biaxially-Oriented Polyethylene Terephthalate). Combining the BOPET film and the taffeta gives a very stable and strong surface material that is ideal for superyachts and cruising sails.

The unique fibre yarn and taffeta lamination process controls the amount of adhesive in every sail, ultimately making a stronger and lighter sail. The weight of GPc sails are well below the weight of sails made with Dacron or other panelled equivalents.

GPc is available in the standard White and Titanium colours. Custom colours are available, but longer delivery times will need to be allowed.


The GPc 0.5 is made with a 50 x 50 light taffeta. The 50 x 50 stands for the size of the yarn which is used to weave the Taffeta, in this case 50 denier in the warp and 50 denier in the weft. The taffeta is then laminated to the BOPET film which is 0.5mil thick. (left image: close-up of non-woven 50x50)

The GPc 0.75 is made with a 50 x 150 taffeta, here the warp yarn is 50 denier and the weft yarn is 150 denier, the BOPET film laminated to the taffeta is 0.75mil. (right image: close-up of non woven 50x150)



All GPc surface membranes that are made in our Stratis facility have used the Stratis Adhesive System.

The principle behind this system functions in a twin pronged approach. One adhesive system is first applied to the surface of the GPc. This adhesive is ‘inert’ and shelf stable at room temperature.

During the membrane production the fibres are coated in-line with a low viscosity ‘reactive’ adhesive system. The reactive system chemically binds to the adhesive system on the GPc surfaces.

After lamination a B-stage cure continues at room temperature for several days.


GPc surface products are exceptional in sun exposure, showing good UV resistance in lab tests and out on the water after years of usage.

The products contain very good UV blockers in the laminating adhesive as well as having an additional UV resistant coating on the coloured versions.

All products are thoroughly tested on UV exposure in a laboratory under extremely harsh conditions. The GPc surface range is tested up to 3,000 hours in the UV test machines, which cycle between UV light and condensation.


As all products, the GPc surface range is tested in house in the laboratory humidity chamber, here we test the resistance against mould growth inside and on the outside of the product.

The GPc surface range has very good mould resistance due to the Stratis biocide system.


Every order of GPc is tested on resistance against peel between the BOPET film and the taffeta substrate to test the bond between these 2 products.

Peel strength tests are provided by the manufacturing facility as well as our in-house laboratory at Doyle Sails New Zealand.

(Top Image: UV Testing Machine checks the levels of radiation)

(Bottom Image: Peel Resistance Machine pulls taffeta apart at a high strength)


GPc 0.5

White/ Technora Natural (image 1)

Titanium Carbon/Technora Black (image 2)

GPc 0.75

White Carbon/Technora Black (image 3)

White Carbon/Technora Natural (image 4)

Titanium Carbon/Technora Black (image 5)


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