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in the PONS Dictionary

I. ˈrust·proof ADJ inv

rustproof
rostbeständig
rustproof coating
Rostschutzanstrich m
rustproof paint
Rostschutzfarbe f <-, -n>

II. ˈrust·proof VB trans

to rustproof sth
etw rostbeständig machen
Present
Irustproof
yourustproof
he/she/itrustproofs
werustproof
yourustproof
theyrustproof
Past
Irustproofed
yourustproofed
he/she/itrustproofed
werustproofed
yourustproofed
theyrustproofed
Present Perfect
Ihaverustproofed
youhaverustproofed
he/she/ithasrustproofed
wehaverustproofed
youhaverustproofed
theyhaverustproofed
Past Perfect
Ihadrustproofed
youhadrustproofed
he/she/ithadrustproofed
wehadrustproofed
youhadrustproofed
theyhadrustproofed
See further verb tables