What can hot melt adhesive stick to? What is the reason why hot melt adhesive doesn't stick well?

Parts pasted with hot melt adhesive are also available in automobiles.

For example:

Some carpet fabric layers are hot melt adhesives, which are formed by hot pressing; The foam pad under the carpet also uses hot melt adhesive; Hot melt adhesive is used to stick filling cotton, wire harness and skylight reinforcement frame to the ceiling and other parts; Hot melt adhesive is also used to cover trunk lid, fabric and body. In daily life, many handicrafts, toys, decorations, etc. Can use hot melt adhesive.

The reason why the paste is not firm:

1, hot melt adhesive has poor adhesion to product materials;

2, the hot melt adhesive has fast curing speed;

3. The distribution of hot melt adhesive is uneven;

4. Insufficient pressing and pasting between products;

5. The quality of hot melt adhesive is not good.