Repair and care

Helaplast (two-component PU glue)

Also: PU glue, 2K glue, two-component glue, hardener RFE

Helaplast is a PU contact cement mixed with a hardener. It is used to permanently glue on patches, loops and fin mounts.

The Packrafting Store describes Helaplast as the ideal glue for standard loops, mounts and larger repairs. It bonds PU, soft PVC, leather and rubber. It's not suitable for use on the go; that's what self-adhesive patches are for. One can (50 g) with hardener is enough for up to six loops.

Mixing ratio

According to the shop, the manufacturer recommends 100:5 (glue to hardener), which corresponds to the 20:1 from the Anfibio blog. The shop itself advises using a bit less hardener (about 100:1) so the bond doesn't become brittle. Mix in a metal or glass cup, not plastic. The mix stays workable for about 1 to 2 hours. Lösit (MEK) helps as a thinner and cleaner.

How Anfibio glues on loops

• dry, well-ventilated room at 15 to 25 °C
• degrease the bonding surfaces with spirit, mark the outline with a waterproof pen
• 1st coat thinly on both surfaces, flash off for about 30 minutes
• 2nd coat on both surfaces, flash off for 5 to 10 minutes until the glue is dry
• put the parts together (they can still be moved), then heat thoroughly with a hair dryer and press firmly from the centre outwards
• afterwards the bond has about 80 % of its strength, after 36 hours it's fully cured

The shop also writes that it has had good experiences with wet bonding according to the manufacturer's instructions. So always check the instructions for your glue too.

Warning: Helaplast is a hazardous material: contains solvents, ventilate well, avoid skin contact and store out of reach of children.

Sources and further reading

• Packrafting Store: PU glue and hardener (Helaplast)
• Anfibio blog: gluing on tie-downs properly (German)
• Anfibio blog: fitting a tracking fin (German)

Research as of 13 Nov 2026. We have marked manufacturer information as such.