The objective of this experiment was to determine the effectiveness of Safesil (SF; 20% sodium benzoate, 10% potassium sorbate, and 5% sodium nitrite) from Salinity, Sweden, on improving the aerobic stability of high-moisture corn (HMC). HMC (32% moisture) was untreated (CTRL) or treated with SF (3 L/t). Twenty replicated silos (7.5 L) per treatment were packed at a density of 658 kg of DM/m³. Half of the silos were not air stressed, while the other half were submitted to a 12-h per week air stress. After 49 d, half of silos were subjected to aerobic spoilage at 22°C and the other half at 34°C. Samples were analyzed for microbial populations, fermentation profile, and aerobic stability (h before a 2°C increase above baseline after exposure to air at 22°C or 34°C). Data were analyzed by ANOVA as a factorial arrangement of treatments using JMP 12.0. There was an interaction (P < 0.01) between treatment and air stress on numbers of yeasts. CTRL subjected to air stress had higher yeast counts compared with no-stressed CTRL (7.01 vs. 4.44 log cfu/g fresh weight), whereas for SF, both stressed and no-stressed treatments, had lower numbers of yeasts (3.05 and 2.94 log cfu/g, respectively). CTRL had a higher (P < 0.01) concentration of ethanol compared with SF (0.58 vs. 0.15%). The lower ethanol production in SF, was associated with a higher dry matter recovery (P < 0.05) compared with CTRL (99.75 vs. 98.25%). There was an interaction between treatment, air stress, and temperature on aerobic stability (P < 0.01). All SF silages, regardless of temperature during spoilage or air stress during storage, were stable for at least 250 h (time measurements were ended). At 22°C, CTRL no-stressed silage spoiled after 56 h, while CTRL air stressed spoiled at 11 h (P < 0.05). At 34°C, CTRL no-stressed silage spoiled at 26 h, while CTRL air stressed silage spoiled immediately (P < 0.05). These findings show that treatment of HMC with Safesil can overcome the effects of air stress during storage and exposure to warm temperatures at feed out.