We found one dictionary that defines the word spray-on postmark:

Art (1 matching dictionary)

1. Glossary of Stamp Collecting Terms (No longer online)

▸ Words similar to spray-on postmark ▸ Usage examples for spray-on postmark ▸ Idioms related to spray-on postmark ▸ Wikipedia articles (New!) ▸ Words that often appear near spray-on postmark ▸ Rhymes of spray-on postmark ▸ Invented words related to spray-on postmark