Caravan panels take a beating — road vibration, weather exposure, UV, and general wear all contribute to cracks, delamination, and joint failure over time. Choosing the best adhesive for caravan panel repair is critical if you want a durable fix that won’t fail weeks later.
Whether you’re dealing with GRP (fibreglass), aluminium skins, or composite sandwich panels, this guide breaks down exactly which adhesives work, when to use them, and how to get a professional result.
What Are Caravan Panels Made From?
Before selecting the right adhesive, you need to understand what you’re bonding.
1. GRP (Glass Reinforced Plastic) Panels
- Common on modern caravans and motorhomes
- Slightly flexible but structurally strong
- Often used for outer skins and rear panels
👉 Typically bonded using structural adhesives like MMA or epoxy
2. Aluminium Skinned Panels
- Thin aluminium outer layer
- Usually bonded to insulation core
- Found on older caravans and some budget models
👉 Requires adhesives that handle metal expansion + vibration
3. Composite / Sandwich Panels
These are the most common:
- Outer layer: GRP or aluminium
- Core: foam or honeycomb
- Inner layer: plywood or plastic
⚠️ Common issue: delamination (layers separating)
👉 Requires gap-filling structural adhesives
How to Recognise Your Caravan Panel Type
If you’re unsure what you’re working with, here’s how to identify it:
- GRP: Slight texture, not cold to touch, may show fibres when damaged
- Aluminium: Smooth, metallic, cold surface, may dent rather than crack
- Composite panel: Feels rigid but hollow when tapped, often thicker
💡 If the panel has cracked but shows a white/grey fibrous structure → it’s GRP
💡 If it bends slightly and springs back → likely composite
Best Adhesives for Caravan Panel Repair
Choosing the best adhesive for caravan panel repair depends on strength, flexibility, and working time.
Below are the top-performing options used in real-world repairs:
1. MMA Structural Adhesives (Best All-Round Option)
👉 Buy here:
- Plexus MA310: Plexus MA310 50ml | Plexus MA310 400ml
- Plexus MA300: Plexus MA300 50ml | Plexus MA300 400ml
Best for:
- GRP panel cracks
- Bonding aluminium to composites
- Structural repairs on caravan bodies
Why they work:
- Extremely high strength
- Bonds dissimilar materials (metal + plastic)
- Excellent gap filling
- Minimal surface prep required
MA300 vs MA310:
- MA300: Very fast cure (3–5 mins)
- MA310: Longer working time (15–20 mins)
👉 For larger panel repairs, MA310 is usually the better choice
2. Epoxy Adhesives (Rigid Structural Repairs)
👉 Buy here:
- Permabond ET500: Permabond ET500 50ml
- Permabond ET5428 (Black/Off-white): Permabond ET5428 50ml
Best for:
- Rigid panel bonding
- Filling deeper cracks
- Areas with minimal movement
Why they work:
- High strength and chemical resistance
- Good for thick bond lines
- Ideal for internal structural repairs
⚠️ Not ideal for high-flex areas — can be too rigid
3. Hybrid Polymer Adhesives (Flexible Bonding & Sealing)
👉 Buy here:
- ARBOBOND Pro Universal: Arbobond Pro Universal White 290ml
- Arbothane 1245: Arbothane 1245 600ml
Best for:
- Non-structural panel bonding
- Sealing joints
- Areas subject to movement or vibration
Why they work:
- Flexible and weather resistant
- Good adhesion to multiple substrates
- Ideal as a secondary bonding or sealing layer
⚠️ Not suitable for structural cracks or load-bearing repairs
4. Flexible Panel Bonding Adhesives (For Movement & Vibration)
👉 Buy here: Simson ISR 70-03 290ml
Best for:
- Bonding caravan panels where movement is expected
- Aluminium or composite panels exposed to vibration
- Roof panels, side panels, and large surface bonding
Why it works:
- Elastic structural bond (handles expansion + vibration)
- Strong adhesion to GRP, aluminium, painted surfaces
- Excellent weather and UV resistance
- Ideal for large panel bonding where rigid adhesives may fail
⚠️ Important:
Not suitable for crack repair or structural fractures — use MMA adhesives like Plexus MA310 for those applications.
Adhesive Comparison Chart
Best adhesive for caravan panel repair chart – MMA vs epoxy vs hybrid polymer
| Adhesive Type | Strength | Flexibility | Gap Filling | Working Time | Best Use Case |
|---|---|---|---|---|---|
| MMA (MA310) | Very High | Medium | Excellent | Medium | Structural panel repair |
| MMA (MA300) | Very High | Medium | Excellent | Fast | Small quick repairs |
| Epoxy (ET500) | Very High | Low | Excellent | Medium | Rigid bonding |
| Epoxy (ET5428) | Very High | Low | Excellent | Medium | Black finish repairs |
| Hybrid Polymer | Medium | High | Good | Long | Sealing & flexible joints |
When to Use Each Adhesive
- Use MMA (MA310/MA300)
→ For cracks, splits, or structural panel repairs
→ Best overall best adhesive for caravan panel repair - Use Epoxy (ET500 / ET5428)
→ For rigid internal repairs or deep filling
→ When movement is minimal - Use Hybrid Adhesives
→ For sealing edges, trims, or non-structural bonding
→ Not for load-bearing repairs
Surface Preparation (Critical Step)
Even the best adhesive for caravan panel repair will fail without proper prep:
Step 1: Clean Thoroughly
Remove dirt, grease, wax, and contaminants
Step 2: Abrade Lightly
Use 80–120 grit sandpaper to create a key
Step 3: Clean Again
Remove dust before applying adhesive
💡 Some MMAs (like Plexus) can tolerate minimal prep, but prep always improves results
Related Guides (Recommended Reading)
If you’re repairing trims or smaller components, see:
👉 Best Adhesive for Caravan Trim Repair (UK Guide)
For bonding mixed materials:
👉 Best Adhesive for Metal to Plastic (UK Guide)
For fibreglass bonding:
👉 How to Glue Fibreglass to Metal (Complete Guide)
Final Thoughts
Choosing the best adhesive for caravan panel repair isn’t about picking the strongest product — it’s about matching the adhesive to the material and the type of repair. For additional background on composite panel construction and behaviour, see:
https://compositesuk.co.uk
- For most jobs → Plexus MA310 is the go-to
- For rigid internal repairs → Epoxy (ET500 / ET5428)
- For sealing and flexibility → Hybrid adhesives
Get the combination right, and your repair will last for years — not just until the next road trip.