Sealant is an important resource for crafting weapons (and more) in Starfield. It is required in large quantities and is present in almost every recipe. In the early stages of the game, it may seem challenging to obtain, but it's not the case. By following these recommendations, you'll always have an abundance of this resource:

1. Visit a trader in New Atlantis named Wen Tseng (located in the UC Distribution Center). She sells Sealant for 5 credits and frequently restocks her supplies.
2. Assault and inspect outposts where various resources are stored.
3. Engage in combat with enemies in space and collect loot from them.
4. Large quantities of Sealant can be found at the Cold Cave Nettle factory on the planet Procyon III.

For convenience, use a universal scanner to facilitate the search for the necessary resources.