Comparison

Cyanoacrylate vs Hot melt: which should you use?

Two fast options. One makes a hard, thin, brittle joint; the other a thick, rubbery, weak one.

The short answer

Superglue when the fit is tight and the joint must be hard and invisible. Hot melt when there is a gap to fill, the materials are awkward, or you want it reversible.

Side by side

	Cyanoacrylate	Hot melt, hot glue
Strength	Medium	Medium
Flexibility	Rigid	Flexible
Gap filling	Low	Medium
Water resistance	Water resistant	Not established
UV resistance	Not established	Poor
How it cures	Moisture cure	Hot melt
Clarity	Clear	Varies
Typical working time	A few seconds	5 to 60 seconds
Typical full cure	24 hours	When fully cool
Maximum temperature	80C	60C
Needs clamping	No	No
Two part	No	No
Removable later	No	No

Highlighted rows are where the two genuinely differ. These describe the families in general, not any particular product, so check the datasheet of whatever you buy.

Choose Cyanoacrylate when

The parts fit precisely. The joint must be thin and hard. It is a visible repair where a bead of plastic would look wrong.

Choose Hot melt, hot glue when

There is a gap. You are bonding fabric, foam, card or something porous and rough. It is a temporary hold, a prototype, or something you may want to peel off later.

What actually separates them

Hot melt is a thermoplastic: it cools rather than cures, which is why it is instant, why it fills gaps, and why it lets go in a hot car or near a radiator. Superglue is rigid and brittle with effectively no gap filling. Neither is structural, and both fail under sustained load.

Cyanoacrylate

The full guide: what it is for, where it fails, and which materials it suits.

Hot melt, hot glue