necessarily vary according to the circumstances in each case inasmuch as the doctrine is essentially an equitable one and for that reason is particularly within the province of the trial court. Only general rules may be laid down for guidance.” (Stark v. Coker, 20 Cal.2d 839, 846 [129 P.2d 390] ; H.A.S. Loan Service, Inc. v. McColgan, 21 Cal.2d 518, 523 [133 P.2d 391, 145 A.L.R. 349]; Automotriz etc. De California V. Resnick, 47 Cal.2d 792, 796 [306 P.2d 1].)
The basic rule stated by our Supreme Court as a guide in the application of this doctrine is as follows: The two requirements are (1) that there be such unity of interest and ownership that the separate personalities of the corporation and the individual no longer exist, and (2) that, if the acts are treated as those of the corporation alone, an inequitable result will follow. (Automotriz etc. De California v. Resnick, supra, 47 Cal.2d 792, 796; Stark v. Coker, supra, 20 Cal.2d 839, 846; Watson v. Commonwealth Ins. Co., 8 Cal.2d 61, 68 [63 P.2d 295]; Minifie v. Rowley, 187 Cal. 481, 487 [202 P. 673].) With respect to the second requirement, it is sufficient that it appear that recognition of the acts as those of a corporation only will produce inequitable results. (Stark v. Coker, supra, p. 846; Watson v. Commonwealth Ins. Co., supra, p. 68.) The general rule is thus stated as follows:
“ ‘Before a corporation’s acts and obligations can be legally recognized as those of a particular person, and vice versa, it must be made to appear that the corporation is not only influenced and governed by that person, but that there is such a unity of interest and ownership that the individuality, or separateness, of such person and corporation has ceased, and that the facts are such that an adherence to the fiction of the separate existence of the corporation would, under the particular circumstances, sanction a fraud or promote injustice. ’ ” (Talbot v. Fresno-Pacific Corp., 181 Cal.App.2d 425, 431 [5 Cal.Rptr. 361]; Temple v. Bodega Bay Fisheries, Inc., 180 Cal.App.2d 279, 283 [4 Cal.Rptr. 300].)
The gist of the eases which have considered the doctrine is that both of these requirements must be found to exist before the corporate existence will be disregarded; that such determination is primarily one for the trial court and is not a question of law; and that the conclusion of the trier of fact will not be disturbed if it be supported by substantial evidence. (See also H.A.S. Loan Service, Inc. v. McColgan, supra, 21 Cal.2d 518, 524; Kasutoff v. Wahlstrom, 196 Cal.App.2d 65, 69