Abstract: Self polishing anti-fouling marine paint compositions, that can be prepared free of organotin, comprise: (i) at least one sparingly soluble organic compound that is an organic acid or an organic acid salt preferably selected from rosin-based compounds, metal salts of saturated fatty acids, either branched-chain or alicyclic; (ii) a copolymer prepared from at least one acrylic monomer, at least one monomer selected from C.sub.1 -C.sub.4 alkyl methacrylates and styrene, and at least one monomer selected from cyclic tertiary amides or imides having an alkenyl group; (iii) at least one sparingly soluble metalliferous pigment; (iv) at least one marine biocide which can also function as the pigment; and optionally (iv) one or more highly insoluble pigments.

Abstract: Shop primer compositions having improved properties comprise (a) fillers and pigments, at least 25 wt. % of which have conductive properties; (b) zinc powder in a weight ratio to fillers and pigments between 1:16 and 1:1; wherein the zinc, fillers and pigments are milled to a sufficient fineness; (c) anti-settling agents; (d) optionally, thickening agents; (e) a silicate-type binder, in an amount such that the weight ratio of the SiO.sub.2 content of the binder to the zinc, fillers and pigments is between 1:4 and 1:16; and (f) solvents.When using the shop primer compositions of the present invention, the welding properties are improved and the health hazards during welding are reduced, without having to remove the primer layer at the welding area. The primer coatings are compatible with the welding techniques generally used in the heavy steel construction industry, including MIG/MAG welding in 3F position.

Abstract: A paint composition comprising a film-forming polymer, and at least one sparingly soluble metalliferous pigment, and wherein said polymer comprises (A) from 20 to 45 wt. % of monomer units of at least one triorganotin salt of an olefinically unsaturated carboxylic acid; (B) from 5 to 35 wt. % of at least one comonomer selected from the group consisting of VP (vinylpyrrolidone), VPi (vinylpiperidone) and VC (vinylcaprolactam), and wherein the total of A+B amounts to from about 40 to about 70 wt. % of the polymer composition; and (C) the balance of said polymer being monomer units of at least one C.sub.1 -C.sub.4 alkyl methacrylate, styrene and mixtures of said methacrylate and styrene.