Surface-coating compositions that have improved resistance to attack by bacteria and fungi contain 0.10 percent to 3.0 percent by weight of a biocidal component selected from the group consisting of (a) compounds having the structural formula (b) compounds having the structural formula (c) compounds having the structural formula wherein each R represents alkyl of 1 to 6 carbon atoms, hydroxymethyl, or hydroxymethoxymethyl; R' represents hydrogen, alkyl of 1 to 6 carbon atoms, phenyl, halophenyl, or -(CH2O)nCH2OH: each R" represents hydrogen, alkyl of 1 to 6 carbon atoms, chloroalkyl of 1 to 4 carbon atoms, phenyl, halophenyl, hydroxymethyl, or-(CH2)nCHO: each R"' represents alkyl of 1 to 6 carbon atoms: m represents 0 to 1; and n represents a number in the range of 0 to 4; and(d) mixtures of said compounds. The substituted oxazolidines preferably contain a total of not more than six oxymethylene units (-CH2O-) in one or more ring substituents.
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