In this work, fully bio-based benzoxazine monomers were synthesized from L-arginine (Larg) and three renewable bio-phenols, viz., cardanol (C), eugenol (E) and thymol (T) with paraformaldehyde using water as the reaction medium. Their curing behavior was ascertained through DSC and confirming the occurrence of ring-opening polymerization (ROP) using FTIR and observed that these benzoxazine monomers polymerizes significantly at lower temperatures (180°C). Curing kinetic analysis indicated that E-Larg resulted the fastest polymerization rate with the lowest activation energy (Ea) of 82.27 and 84.02 J/g from Kissinger an Ozawa plots respectively. Further, all the coated specimens possess uniform surface with corrosion protection efficiency of above 97%. Also, the polybenzoxazines showed better hydrophobic behavior with the highest contact angle value of 146°. Poly(C-Larg) possess the lowest surface energy of 20.31 mJ/m2. The present study highlights that water mediated synthesis of bio-based benzoxazines enable the route for minimal environmental impact and also provides tunable higher performance coatings.