To properly care for your crochet handbag made out of cotton and protect it from water damage, it is advisable to use a waterproof spray, especially during winter or rainy seasons. Begin by ensuring the handbag is clean and dry. Shake the can well and apply the spray evenly from 6-8 inches away (approximately 15-20 centimeters), covering the entire surface of the handbag. Allow the spray to dry for at least 24 hours before using or exposing it to water. To maintain the waterproofing on your crochet handbags made of cotton, it is recommended to reapply the waterproof spray every 4-6 weeks, or as needed based on usage and exposure to water. Remember to follow the manufacturer's instructions for the specific waterproof spray being used for the best results.