Verbseoul.
하다 verb
방수하다bangsuhadato waterproof

To say to waterproof politely in the present tense, use 방수해요 (bahng-soo-hae-yoh). Below is the full conjugation of 방수하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
방수해
bahng-soo-hae
방수해요
bahng-soo-hae-yoh
방수합니다
bahng-soo-hahm-nee-dah
Past
방수했어
bahng-soo-hae-ssuh
방수했어요
bahng-soo-hae-ssuh-yoh
방수했습니다
bahng-soo-hae-sseum-nee-dah
Future
방수할 거야
bahng-soo-hahl- -guh-yah
방수할 거예요
bahng-soo-hahl- -guh-yae-yoh
방수할 겁니다
bahng-soo-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
방수하세요
bahng-soo-hah-sae-yoh
Suggestion / Let's Polite (요)
방수해요
bahng-soo-hae-yoh
Question Polite (요)
방수해요?
bahng-soo-hae-yoh-?
Connective “and” — (고)
방수하고
bahng-soo-hah-goh
Conditional “if” — (면)
방수하면
bahng-soo-hah-myuhn
Noun form — (기)
방수함
bahng-soo-hahm