Tips for the Cheapest Paint barrel: Open the lid and use a screwdriver to pry loose the bayonet under the lid of the Cheapest Paint barrel. Just pry it halfway, don't pry it all.
1. Open the lid at 45 degrees. The bottom half of the lid has a rubber gasket for sealing. Do not break it. This is the key to ensuring the tightness. If the tightness is better, the longer the storage time will be.
2. After opening the lid, the paint can be used normally. Note that when using, try not to let the rubber pad occupy the paint, so as not to affect the air tightness of the box cover.

3. Put the rubber pad under the cover of the Cheapest Paint barrel first, and then close the lid. When closing the lid, make sure that the rubber pad is sandwiched between the lid and the barrel mouth. Do not let the plastic pad fall into the Cheapest Paint barrel.
4. After closing, press the bayonet down firmly to fasten it. Don't be too tight, just buckle it.
5. The plastic pad inside the cover is the key to ensuring air tightness. Be careful not to break it when opening the cover.
6. When closing the lid, the plastic pad is particularly easy to fall into the Cheapest Paint barrel. Be sure to close the lid after the plastic cushion is secured on the mouth of the bucket.