I need to bond HDPE to Galvanized steel.
Its a boat trailer so needs to be waterproof .... but this is not load bearing, so no high shear strength required.

The Galv is not fresh, which can be problematic to do anything with.
I am aware that there is a need to apply heat to HDPE prior to any bonding to de-wet the slippery finish.

ideally something like a silicone or rubber €˜flexible adhesive would be best.

I have 3M 5200 which bonds most things marine but dont think it works with MDPE.

Suggestions?

Osprey wrote:

I need to bond HDPE to Galvanized steel.
Suggestions?

Scotchweld?
a low surface energy primer followed by a rubberised superglue?
a low surface energy version of double sided VHB tape?

On 30/03/2021 23:15, Osprey wrote:
I need to bond HDPE to Galvanized steel.
Its a boat trailer so needs to be waterproof .... but this is not load bearing, so no high shear strength required.

The Galv is not fresh, which can be problematic to do anything with.
I am aware that there is a need to apply heat to HDPE prior to any bonding to de-wet the slippery finish.

ideally something like a silicone or rubber €˜flexible adhesive would be best.

I have 3M 5200 which bonds most things marine but dont think it works with MDPE.

Suggestions?

I did a successful and waterproof repair to a cracked wheelbarrow
(probably HDPE) with a couple of perforated galvanized strips pop
riveted on the back to prevent the cracks moving, then covering the top
side with flashband used with flashband primer. You can't really glue
"edges" of PE sheet, you need to make use of the area. If it is just
sealing with no significant load, is the geometry suitable for Sylglas /
Denso tape type material? Or "external" mastic as used for gutter
repairs, door frame to brick joints, etc.

On 31/03/2021 12:26, newshound wrote:


I did a successful and waterproof repair to a cracked wheelbarrow
(probably HDPE) with a couple of perforated galvanized strips pop
riveted on the back to prevent the cracks moving, then covering the top
side with flashband used with flashband primer. You can't really glue
"edges" of PE sheet, you need to make use of the area. If it is just
sealing with no significant load, is the geometry suitable for Sylglas /
Denso tape type material? Or "external" mastic as used for gutter
repairs, door frame to brick joints, etc.

I don't want to rivet or screw to the metal dues to corrosion issues.
Can't have any metal in front on the HDPE .. this is being fixed to
provide a buffer pad from the metal.

On 31/03/2021 08:57, Andy Burns wrote:
Osprey wrote:

I need to bond HDPE to Galvanized steel.
Suggestions?

Scotchweld?
a low surface energy primer followed by a rubberised superglue?
a low surface energy version of double sided VHB tape?



Problem is what ? ..... StochWeld is a group brand of a load of differ
net adhesives.


So far only product that states it will bond HDPE is:
"Mr Sticky's Poly-Bonder" a 2 part epoxy based adhesive ..... but its
not cheap, or easy to get in UK

rick wrote:

Problem is what ? ..... StochWeld is a group brand of a load of differ
net adhesives.

DP8005

or 3M VHB tape LSE family (differences are just thickness/width)

So far only product that states it will bond HDPE is:
"Mr Sticky's Poly-Bonder" a 2 part epoxy based adhesive ..... but its
not cheap, or easy to get in UK

Nothing that glues low surface energy plastics is cheap.

On 02/04/2021 14:45, Andy Burns wrote:
rick wrote:

Problem is what ? ..... StochWeld is a group brand of a load of differ
net adhesives.

DP8005

or 3M VHB tape LSE family (differences are just thickness/width)

So far only product that states it will bond HDPE is:
"Mr Sticky's Poly-Bonder" a 2 part epoxy based adhesive ..... but its
not cheap, or easy to get in UK

Nothing that glues low surface energy plastics is cheap.

+1

Although I was pleased that my repair has proved structurally very sound
over ten years or so. As described in other post, cracked polyethylene
pop riveted to perforated galvanised strip at the back for structural
strength, flashband (used with its primer) over the damaged area on the
wet side. No sign of delamination.