A low VOC composition comprising, unsaturated alkyd resin P' obtained by reaction in a process between the following components: Optional Component A comprising from 0 to 30% by weight of naturally occurring Rosin, the Rosin comprising from 40 to 80 parts per hundred by weight of Rosin of an unsaturated mono carboxylic acid comprising at least one C 15-25 cyclohydrocarbo moiety capable of undergoing a Diels Alder or Ene reaction; Component B comprising from 25 to 80% by weight of a linear C 12-60 hydrocarbo carboxylic acid comprising at least one conjugated ethylenically unsaturated double bond; Optional Component C comprising from 1 to 30% by weight of an ethylenically unsaturated C 5-6 hydrocarbo dicarboxylic acid, ester thereof, and/or anhydride thereof, being reactive as a dienophile and/or enophile with Component B and/or Component A where present; Component D comprising from 1 to 40% by weight of at least one polyhydric alcohol (polyol); Optional Component E comprising at least one monomer other than any of Components A to D; the total of Components A to E being100%. to obtain the alkyd resin P' and then in an optional blending step, adding Component C to the alkyd resin P' to form an admixture therewith; Component C being present in an amount of from 1 to 30 parts by weight with respect to 100 parts of monomers to above; where Component C is at least used as a monomer in process and/or as a diluent in the blending step; where the alkyd resin P' obtained from process (i) has an acid value of no more than 50 mg KOH per g of the solid alkyd resin; (ii) has a number average molecular weight (M n) of at least 1200 g/mol; (iii) optionally has an oil length less than 80 and where in case Component C is used as a monomer in process, the alkyd resin has an oil length less than 80; and (iv) optionally has a renewable content of at least 50% by weight of components to where present; and where low VOC denotes that the total amount of organic compounds that have a boiling point from 50 to 250 °C that are present in the composition is less than 100 g/l. Optional Component A comprising from 0 to 30% by weight of naturally occurring Rosin, the Rosin comprising from 40 to 80 parts per hundred by weight of Rosin of an unsaturated mono carboxylic acid comprising at least one C 15-25 cyclohydrocarbo moiety capable of undergoing a Diels Alder or Ene reaction; Component B comprising from 25 to 80% by weight of a linear C 12-60 hydrocarbo carboxylic acid comprising at least one conjugated ethylenically unsaturated double bond; Optional Component C comprising from 1 to 30% by weight of an ethylenically unsaturated C 5-6 hydrocarbo dicarboxylic acid, ester thereof, and/or anhydride thereof, being reactive as a dienophile and/or enophile with Component B and/or Component A where present; Component D comprising from 1 to 40% by weight of at least one polyhydric alcohol (polyol); Optional Component E comprising at least one monomer other than any of Components A to D; in an optional blending step, adding Component C to the alkyd resin P' to form an admixture therewith; Component C being present in an amount of from 1 to 30 parts by weight with respect to 100 parts of monomers to above; (i) has an acid value of no more than 50 mg KOH per g of the solid alkyd resin; (ii) has a number average molecular weight (M n) of at least 1200 g/mol; (iii) optionally has an oil length less than 80 and where in case Component C is used as a monomer in process, the alkyd resin has an oil length less than 80; and (iv) optionally has a renewable content of at least 50% by weight of components to where present; and