agent was prepared by mixing the components at room temperature see table 2 amounts in wt the coating agent was then ready for application 12 g of a mixture of mono di and tri esters of the phosphoric acid of 2 hydroxyethyl acrylate were added to 100 g of the solution from example 1a or 1b and intensive stirring was carried out for 5 minutes distilled water was added to this mixture 1 1 the pretreatment solution example 3a 3b was then ready for application the pretreatment solution exhibited lower foam formation than the solution of example 1 during processing the solution of example 3a or 3b was applied to a dry hdg sheet metal substrate which had been degreased with alkaline cleaners and was applied with a roll coater drying was carried out for 5 minutes at 70 u00b0 c a coating agent according to example 2 was then applied by means of a roll coater in a layer thickness of about 5 u03bcm the coatings were then immediately cured by irradiation with uv lamps fusion vps 1600 type h d radiator each 240 w cm 100 power at a belt speed of 20 m minute t bend and reverse impact tests were performed see table 3 analogous tests were also carried out using cold rolled metal sheets and with aluminum as the substrate the test results likewise showed an improved adhesion behavior of the pretreatment solutions according to example 3 a degreased dry hdg substrate was rinsed with a solution of.