25 Products
ISOPON
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Isopon: understand the range before choosing
Isopon is U-POL's vehicle body-repair range, covering fillers, aerosols, coatings, fibreglass and accessories. The 25 products represented here include P38 multipurpose filler, P40 glass-fibre filler, plastic-bumper and alloy-wheel products, metal repair compounds, BPO hardener, Zinc 182 primer, clearcoat, multipurpose primer, stone-chip coating, aluminium mesh, putty and applicators. Each belongs to a defined substrate and repair stage.
AutoMotoPart currently lists 25 Isopon items. The largest Isopon groups are 25 maintenance entries. Isopon totals can change, so a category count is orientation rather than proof that a particular reference suits a vehicle, workplace or job. The exact Isopon listing, its current technical information and the item in front of you must agree.
What the Isopon page actually covers
| Product group in this range | Current entries | Selection focus |
|---|---|---|
| Maintenance | 25 | Use clean flexible applicators of suitable size; prevent cured residue scoring the next spread. |
Filler appears in eight titles, glass fibre in four and primer in four. P38 and P40 each occur in four pack sizes; Zinc 182 occurs in 450ml, one-litre and 2.5-litre formats. The page also separates 250ml plastic, alloy and metal products. Pack volume changes coverage but not the allowed substrate, hardener or process.
Build a reliable shortlist
A durable cosmetic repair needs sound structure, compatible materials and controlled layer thickness. Check whether corrosion continues behind the panel, whether a bumper has torn around a sensor or mounting, and whether a wheel has a crack or deformation that rules out filler. Escalate structural uncertainty before sanding removes evidence.
| Check | Why it matters | Useful evidence |
|---|---|---|
| Substrate | Steel, aluminium, GRP, SMC and bumper plastics need different preparation and adhesion | Identified material and exact Isopon technical data |
| Damage type | Dent, pinhole, crack, rust hole, scuff and coating chip are not the same repair | Inspection from both sides and a supported repair limit |
| Filler system | P38, P40, alloy, metal and plastic products have different reinforcement and flexibility | Complete product name and substrate approval |
| Hardener | Mix ratio and temperature control pot life, cure and final quality | Fresh compatible BPO product, measured ratio and technical sheet |
| Abrasive sequence | Coarse scratches or overheated plastic can remain visible through paint | Product-specific shaping and finishing grades with extraction |
| Coating stack | Filler, primer, base and clear must be compatible and sufficiently cured | Recoat windows, flash times and paint-system information |
Do not apply Isopon filler over rust scale, wax, silicone, damp substrate or unsanded glossy paint. If a test area lifts, remains soft or shows pinholes, remove the failed material and resolve preparation or mixing rather than burying it under primer.
P38, P40 and choosing the repair structure
Isopon P38 is described by U-POL for minor dents and scratches in supported metal bodywork and for shaping medium-depth damage. P40 is glass-fibre reinforced and appears in official guidance for defined holes with aluminium mesh where required. P40 does not turn severely thinned or structural metal into a sound panel; the surrounding substrate must carry the repair.
Remove active corrosion beyond the visible edge and taper coatings to sound adhesion. Apply filler in controlled layers rather than one excessive mass, avoiding air pockets. Shape during the supported cure stage, then sand with a block that follows the panel. Use a fine finishing filler or putty only for supported pinholes and scratches, not to bridge movement or replace the main repair.
Hardener ratio, mixing and curing
BPO hardener is designed for compatible polyester fillers. Use the exact ratio stated for product and temperature, on a clean non-absorbent mixing surface. Fold filler and hardener together until colour is uniform without whipping in air. Mix only an amount that can be spread during the working time; never return mixed product or a contaminated applicator to the tin.
Too little hardener can leave soft material, while too much can shorten working time and create defects. Cold substrate, thick layers or expired product also alter cure. Do not accelerate with uncontrolled heat. Confirm the filler sands to the expected dry powder and is cured through before coating. Dispose of mixed residues and hardener packaging according to their safety information.
Plastic bumpers, alloy wheels and metal repairs
Identify bumper plastic from markings or repair information because flexible thermoplastics, rigid plastics and composite panels behave differently. Inspect mounting tabs, sensor brackets and impact reinforcement. V-grooving, backing repair, adhesion promoter and filler sequence must follow the exact kit. A cosmetic filler cannot certify an impact-damaged bumper or repair a weakened structural beam.
Alloy-wheel filler addresses supported surface scuffs after the wheel is inspected. Cracks, bends, severe rim damage, bead-seat defects or unknown earlier welding require specialist assessment rather than filler. Metal Fix and Leak Stop likewise remain bounded by exact substrate, chemical exposure, temperature and damage limits; do not use broad resistance claims as permission to patch fuel, brake or pressurised safety systems.
Zinc 182, primers, clearcoat and stone-chip layers
U-POL technical data describes Zinc 182 as a rust-inhibiting primer for supported prepared surfaces and says loose rust must be removed, with more complete rust removal improving the outcome. Aluminium and zinc-coated substrates can require an etch-primer stage. Follow the exact abrasion, degreasing, film build, drying and overcoating information rather than treating zinc wording as a substitute for preparation.
Multipurpose primer, stone-chip protector and clearcoat occupy different layers. Confirm compatible substrate and colour-coat system, mask edges and apply in a ventilated controlled area. Aerosol coats should be even and allowed the stated flash time. Stone-chip texture cannot hide structural corrosion; clearcoat cannot correct solvent pop, moisture or an uncured base underneath.
Sanding dust, chemical exposure and final inspection
Body-repair dust can contain filler resin, glass fibre, old coating and metal. Use extraction at the sanding tool or local source, suitable respiratory and eye protection and protective clothing. Do not dry sweep or blow dust around the workshop. Hardeners and coatings need skin-contact controls and ventilation based on the safety data; washing with solvent is not acceptable skin cleaning.
Guide coat and raking light reveal low spots, scratches and pinholes before paint. Feel with a clean flat hand only after dust removal and adequate cure. Check feather edges for lifting and inspect the rear of the repair for corrosion protection where accessible. Refit sensors, lamps and trim without trapping fresh coating, and follow paint cure before washing, polishing or road exposure.
From identification to a checked result
| Stage | Good practice for this range | Mistake to avoid |
|---|---|---|
| Assess | Identify substrate, damage depth, corrosion and structural limits | Filling before checking the rear of the panel or wheel condition |
| Prepare | Remove loose material, degrease, abrade and control dust | Applying over rust, silicone, gloss or moisture |
| Mix | Measure compatible hardener and mix a small uniform batch | Adding extra hardener to speed an uncertain cure |
| Shape | Apply controlled layers and sand through the specified sequence | Building one thick layer or leaving coarse scratches |
| Coat | Prime, protect and clear within compatible flash and cure windows | Painting over soft filler or active corrosion |
Record the Isopon product, hardener, approximate ratio, temperature, substrate, abrasive sequence and coating system. If sinkage or lifting appears later, that process record helps isolate excessive depth, incomplete cure, trapped contamination or incompatible layers.
Reading real Isopon references
The Isopon names below are examples from the current range and show why the complete description matters. They are not universal Isopon recommendations and should not be treated as a fitment list. Within Isopon, a shared family word can conceal a different dimension, connector, material, pack format, operating condition or installation side.
| Example listing | What to verify beyond the name |
|---|---|
| Isopon Body Filler Applicators - Pack Of 3 | Substrate, exact Isopon filler, damage limit, reinforcement and hardener |
| Isopon BPO Hardener - 20g | Mix ratio, working time, application depth, cure and sanding grades |
| Isopon Leak Stop 250ml | Plastic, alloy or metal condition and whether structural repair is excluded |
| Isopon Alloy Wheel Filler - 250ml | Primer and coating compatibility, ventilation, dust control and recoat window |
| Isopon Metal Fix 560ml | Substrate, exact Isopon filler, damage limit, reinforcement and hardener |
| Isopon Metal Fix 250ml | Mix ratio, working time, application depth, cure and sanding grades |
| Isopon P38 Body Filler - 600ml | Plastic, alloy or metal condition and whether structural repair is excluded |
| Isopon P38 Body Filler - 1.2 Litre | Primer and coating compatibility, ventilation, dust control and recoat window |
The examples include P38, P40, alloy, metal and plastic products beside primer, clearcoat, mesh and applicators. Keep the full Isopon name and pack instructions. A 250ml tin does not reveal whether its contents are flexible, reinforced, metallic or intended for a coating stage.
Common errors around Isopon products
- Applying Isopon filler over active rust, moisture, wax or glossy unsanded paint.
- Using P38 or P40 as a structural repair for weakened load-bearing metal.
- Guessing BPO hardener quantity or adding extra to force a faster cure.
- Using one large filler batch beyond its working time.
- Repairing a cracked or bent alloy wheel cosmetically without specialist assessment.
- Assuming all bumper plastics accept the same filler and preparation.
- Sanding glass-fibre filler without effective dust and skin controls.
- Applying primer or clearcoat before filler and underlying coatings have cured.
Isopon questions and answers
Q: What Isopon products are on this page?
A: The range includes P38 and P40 fillers, metal, alloy and plastic products, hardener, primers, clearcoat, stone-chip coating, mesh and applicators.
Q: What is P38 used for?
A: U-POL describes it for supported dents and scratches in suitable bodywork, followed by sanding, priming and paint.
Q: What is P40 used for?
A: It is glass-fibre reinforced for defined hole repairs in supported metal, with mesh where the process requires it.
Q: Can filler repair structural rust?
A: No. Structurally weakened or safety-critical metal needs an approved structural repair or replacement.
Q: How much hardener should be added?
A: Use the exact Isopon technical-data ratio for the product and temperature; do not estimate by desired cure speed.
Q: Why has filler stayed soft?
A: Incorrect ratio, poor mixing, cold conditions, excessive depth or old material can contribute; remove failed filler and diagnose it.
Q: Can bumper filler be used on every plastic?
A: No. Identify the polymer and follow the product's supported preparation and repair method.
Q: Can alloy filler repair a cracked wheel?
A: No. Cracks, bends and bead-seat damage require specialist wheel assessment.
Q: Does Zinc 182 work over loose rust?
A: Its technical data requires loose rust removal and says more complete removal improves effectiveness.
Q: Can clearcoat hide poor preparation?
A: No. Scratches, contamination, solvent defects and uncured layers remain underlying faults.
Q: How should sanding dust be controlled?
A: Use source extraction, suitable respiratory and eye protection and dust-free housekeeping.
Q: What repair details should be recorded?
A: Keep product, hardener ratio, substrate, temperature, abrasive sequence and coating stages.
