When you lay the caulking bead, try to push the caulking into the gap instead of dragging it onto the gap. This greatly increases the possibility that the sealant will adhere to both surfaces, as it will press the sealant into the gap without pulling it in.

As for the sample delivery period, the existing samples need 2-3 days, most of which are free of charge. If you want your own design, it will take 7-10 days, depending on whether your design requires new molds, etc. In any case, we will respond to your request quickly.