Difficult
How to glue Aluminium to Powder coated metal
The short answer
A flexible MS-polymer adhesive is the best-supported starting point for Aluminium to Powder coated metal. Sika Stixall Maximum Grab has official documentation whose stated scope covers this joint at material-class or exact-substrate level. Prepare both faces as specified, maximise overlap, minimise peel and validate a representative coupon before critical use.
Why this bond behaves the way it does
A flexible MS-polymer adhesive matches the joint's porosity, stiffness and gap needs better than the listed alternatives. The recommendation is graded B because official documentation supports the relevant substrate classes, while the exact production grades and joint geometry still need verification.
What to use
Best choice
MS polymer
Use a flexible MS-polymer adhesive as the first route because the cited product and preparation documents cover the controlling substrate classes. This is strongly supported but still requires a coupon for the exact grades.
Gaps: Maintain the bond line stated by the manufacturer and do not clamp it dry.
Curing: Do not confuse initial grab or handling strength with full cure.
Watch out: Coupon-test the exact substrate grades and surface finish.
Also works
Two-part epoxy
A toughened two-part epoxy is an alternative only when a current product document covers both actual faces, the bond-line thickness and the service environment.
Gaps: Maintain the bond line stated by the manufacturer and do not clamp it dry.
Curing: Do not confuse initial grab or handling strength with full cure.
Watch out: Coupon-test the exact substrate grades and surface finish.
Also works
Grab adhesive, no-nails
A grab adhesive is an alternative only when a current product document covers both actual faces, the bond-line thickness and the service environment.
Gaps: Maintain the bond line stated by the manufacturer and do not clamp it dry.
Curing: Do not confuse initial grab or handling strength with full cure.
Watch out: Coupon-test the exact substrate grades and surface finish.
Avoid
Cyanoacrylate
Avoid treating a coating as if it were bare substrate. The bond is limited by coating adhesion, so remove weak finish and test solvent compatibility before committing to the full joint.
Gaps: Use only on the thin, close-fitting joint stated by the exact grade.
Curing: Do not confuse initial grab or handling strength with full cure.
Watch out: This avoidance is for the ordinary unqualified family, not a specialist grade with explicit manufacturer evidence.
What to avoid
Avoid treating a coating as if it were bare substrate. The bond is limited by coating adhesion, so remove weak finish and test solvent compatibility before committing to the full joint.
Preparing the surfaces
Aluminium
Degrease before abrading so oil is not spread. For WEST SYSTEM epoxy, dry-sand aluminium with 80-grit paper, remove residue and apply promptly. Structural production work may require a qualified etch or conversion treatment; do not improvise hazardous industrial etches from a general guide.
Powder coated metal
Identify the coating and confirm that it is firmly attached. Wash, rinse and dry; remove polish or oil with a compatible cleaner. Lightly abrade a hidden bond area to a uniform matt finish if allowed, then clean again. For structural loads, test whether coating removal to bare prepared metal is required.
How to do it
Dry-fit first. Meter, mix or prime exactly as the selected product requires. Apply a controlled bond line, assemble within working time, clamp without squeezing the joint dry and leave supported through the full stated cure.
Working, clamping and cure times
Follow the current Sika Stixall Maximum Grab instructions. Working time, handling strength and full cure are different. Cold conditions, thick beads and two impermeable faces can extend the cure.
If the conditions are harder
| Condition | Verdict | Notes |
|---|---|---|
| Outdoor use | Works with care | Sika Stixall Maximum Grab has manufacturer outdoor, weathering or UV-related evidence. That does not remove the need to seal porous edges, accommodate movement and keep the joint within product limitations. |
| Water and wet areas | Works with care | Sika Stixall Maximum Grab has manufacturer water-resistance or waterproof wording, but that wording is not expanded into continuous-immersion approval. Seal absorbent edges and keep the assembly within the exact documented exposure. |
| Heat and cold | Not enough evidence | The cited evidence does not give a complete service-temperature range for this exact assembly. Do not infer one from adhesive chemistry alone. |
Read the current safety data sheet. Provide ventilation, protect skin and eyes, and test an offcut for solvent attack, staining, stress cracking or coating lift. This is not an engineering approval for safety-critical loads.
Products that fit
Ordered by how well they suit this specific job. Nothing is ranked by what it pays.
Sika Sika Stixall Maximum Grab
MS polymer
Official manufacturer documentation covers the relevant joint or both material classes without broadening its literal scope.
We may earn a commission from links on this page. It never changes which adhesive we recommend.
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Where this comes from
Reviewed 8 October 2026. Overall confidence: Strong evidence.
Sources used for this guide:
- 3M Bonding Solutions: Adhesives and Tapes Selection Guide (TECHNICAL_MANUAL)
- Permabond Adhesive Application Tips (MANUFACTURER_PAGE)
- Sika Stixall Maximum Grab Product Data Sheet (PDS, Feb 2026)
- Surface Preparation (MANUFACTURER_PAGE)
- Surface Preparation and Pretreatment for Structural Adhesives (TECHNICAL_MANUAL, Oct 2018)
Always read the instructions and safety information supplied with the product you buy. Where they differ from anything here, follow the manufacturer.