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FASTGLAS
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Fastglas: understand the range before choosing
Fastglas is U-POL's ISOPON glass-fibre repair system. The current products comprise laminating resin, glass-fibre mat, finer tissue and Junior or Senior kits. Resin and hardener create the cured matrix; mat and tissue provide different reinforcement and surface roles. None is a complete repair until substrate, mixing, lay-up and cure are correct.
AutoMotoPart currently lists 7 Fastglas items. The largest Fastglas groups are 7 maintenance entries. Fastglas totals can change, so a category count is orientation rather than proof that a particular reference suits a vehicle, workplace or job. The exact Fastglas listing, its current technical information and the item in front of you must agree.
What the Fastglas page actually covers
| Product group in this range | Current entries | Selection focus |
|---|---|---|
| Maintenance | 7 | Match resin volume, mat or tissue reinforcement, kit contents, repair area, substrate and exact hardener instructions before mixing. |
Four titles contain glass-fibre reinforcement or complete kits and three contain resin only. The mat is listed at 0.55m², tissue at 1m² and resin at 250ml, 500ml or one litre. Junior and Senior describe different kit formats, but the package contents and coverage must be checked rather than inferred from the name.
Build a reliable shortlist
Assess the repair from both sides where possible. Establish substrate, damage extent, access, final load and exposure to heat, water or chemicals. Then plan the fibre orientation, number of layers, overlap, resin quantity and finishing route from the exact Fastglas instructions. Escalate structural or safety-related damage to an approved repair method.
| Check | Why it matters | Useful evidence |
|---|---|---|
| Damage | Crack, small hole, missing section and structural corrosion need different repair decisions | Clean inspection from front and rear |
| Substrate | Metal, existing GRP, wood and rigid material prepare differently | Fastglas instructions and sound exposed surface |
| Reinforcement | Mat supplies bulk strength while tissue refines the outer layer | Layer schedule, overlap and supported orientation |
| Resin | Too little leaves dry fibres and too much adds brittle resin-rich mass | Measured area, fibre weight and package guidance |
| Hardener | Ratio and working time vary with the exact system and temperature | Current label, measured batch and ambient conditions |
| Safety | Vapour, flammability, skin contact, glass fibres and sanding dust all matter | Safety sheet, ventilation, PPE and waste plan |
Do not size the repair only to the visible hole. Corrosion and delamination can extend beneath paint, and a laminate needs a broad sound keyed margin. If tapping, probing or rear inspection finds weak metal, stop and define the proper cut-out and repair boundary first.
Resin sizes and repair kits
The 250ml, 500ml and one-litre products are laminating resin and still need the supported Fastglas hardener plus mat or tissue. Choose volume from planned layers and sensible waste, not the temptation to mix the entire tin. Larger batches build heat faster and may gel before the reinforcement is wetted and positioned.
Junior and Senior kits bring resin, hardener, matting and application items together, but confirm their current contents, coverage and PPE before starting. Included gloves or a brush do not replace the safety-sheet assessment or extra consumables. Lay out scissors, mixing vessels, protection and finishing materials before opening the resin.
Glass-fibre mat and tissue do different work
Chopped-strand mat builds the principal reinforced laminate. Cut or tear the required pieces dry, graduating each layer so the patch spreads onto sound keyed material. Curves and corners need small manageable pieces that conform without springing up. Avoid sharp internal corners and trapped air, both of which weaken the cured section.
Tissue uses finer fibres to improve the surface and can help close the weave before finishing. It does not provide the same bulk reinforcement as sufficient mat. Apply it only within the documented lay-up, wet it without floating the fibres and avoid a resin-rich skin that looks smooth but cracks under movement.
Substrate preparation and repair limits
Remove corrosion, loose laminate, paint, grease and contamination until the remaining surface is sound. Feather and key the supported margin with the specified abrasive, then remove dust and clean by the product method. Any backing or former must release cleanly and withstand resin, cure heat and the planned shape.
A cosmetic glass-fibre patch is not evidence of restored crash or load-bearing performance. Do not bridge unsafe sills, chassis rails, suspension mounts, restraint points, fuel tanks, pressurised parts or heat-critical exhaust components. Where a vehicle repair method calls for welding, panel replacement or a particular composite process, follow that method instead.
Measured mixing, wet-out and cure
Bring resin and workpiece into the permitted temperature range and measure the exact hardener proportion on the current Fastglas pack. Mix gently but thoroughly, scraping the vessel sides without whipping in air. Start a timer and activate only the amount that can be applied inside the working time; never add solvent or extra hardener to change viscosity or speed.
Brush a controlled resin layer onto the prepared surface, place the first reinforcement and stipple from the centre to remove pale dry areas and trapped bubbles. Add subsequent layers within the supported window. Leave the repair undisturbed for the full cure dictated by batch, temperature and thickness; a tack-free surface alone does not prove through-cure.
Ventilation, dust and waste control
U-POL's resin safety information identifies significant vapour, skin, eye and flammability hazards. Work with effective extraction that does not create an ignition source and keep containers closed away from heat. Wear the exact respiratory and chemical protection specified; ordinary paper dust masks and casual disposable gloves may not be sufficient for liquid resin exposure.
Once fully cured, trim with guarded tools and use extraction while sanding. Glass and cured-resin dust can irritate skin, eyes and lungs, so keep it out of the vehicle interior and change contaminated clothing carefully. Do not pour uncured resin or hardener into drains. Allow only safely managed small residue to cure where instructions permit and use the correct hazardous-waste route for liquids and contaminated materials.
From identification to a checked result
| Stage | Good practice for this range | Mistake to avoid |
|---|---|---|
| Assess | Expose the full damage and rule out structural or safety-critical misuse | Laminating over rust or a load-bearing defect |
| Plan | Cut dry reinforcement, calculate layers and arrange ventilation and PPE | Mixing resin before the work area is ready |
| Prepare | Reach sound keyed substrate and remove all dust and contamination | Bonding to paint, grease, moisture or weak edges |
| Laminate | Measure hardener, mix a small batch, wet fibres and remove air | Guessing ratio or creating a resin-rich patch |
| Cure and finish | Allow full cure, control sanding dust and inspect both faces | Sanding soft laminate or hiding voids with filler |
Record resin batch, hardener, ratio, ambient temperature, layer schedule and cure time. That evidence helps explain a later soft area or delamination and prevents leftover Fastglas components being paired with an unknown hardener.
Reading real Fastglas references
The Fastglas names below are examples from the current range and show why the complete description matters. They are not universal Fastglas recommendations and should not be treated as a fitment list. Within Fastglas, 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 |
|---|---|
| Fastglas Glass Fibre Mat - 0.55m | 0.55m² mat area, main reinforcement role, dry cutting and planned overlap |
| Fastglas Glass Fibre Tissue - 1m | 1m² tissue area, finer finishing role and underlying mat schedule |
| Fastglas Glass Fibre Senior Kit | Senior kit contents, coverage, hardener ratio, PPE and usable batch size |
| Fastglas Glass Fibre Junior Kit | Junior kit contents, repair area, preparation and finishing materials |
| Fastglas Resin - 500ml | 500ml resin, exact hardener, reinforcement requirement and batch planning |
| Fastglas Resin - 250ml | 250ml resin, package ratio, working time and small-repair coverage |
| Fastglas Resin - 1 Litre | One-litre resin, storage, multiple small batches and sufficient mat or tissue |
The three resin volumes share a system role but not an invitation to mix the whole container. Mat and tissue dimensions describe available area, not cured strength. Kit size, resin volume and fibre area must all be reconciled with the actual layer plan.
Common errors around Fastglas products
- Using tissue alone where the repair needs reinforcing mat.
- Laminating over rust, paint, oil, water or weak substrate.
- Using glass fibre to conceal a safety-critical structural defect.
- Guessing the hardener ratio or adding extra to hurry the cure.
- Mixing more activated resin than can be placed within working time.
- Working near flames, sparks, heaters or uncontrolled electrical equipment.
- Sanding before the laminate has cured through.
- Pouring resin, hardener or contaminated washings into a drain.
Fastglas questions and answers
Q: What Fastglas products are represented?
A: Glass-fibre mat, finer tissue, Junior and Senior kits and resin in 250ml, 500ml and one-litre packs.
Q: Does Fastglas resin work by itself?
A: No. A reinforced repair needs the exact hardener and the supported mat or tissue layer schedule.
Q: What is mat used for?
A: It forms the main glass-fibre reinforcement across a prepared repair area.
Q: What is tissue used for?
A: It creates a finer outer layer or surface within the supported system; it does not replace structural mat.
Q: Can hardener be estimated by eye?
A: No. Measure the ratio on the current product instructions for the batch and temperature.
Q: Why mix small batches?
A: Activated polyester resin has limited working time and generates heat, especially in a larger concentrated mass.
Q: Can Fastglas repair a corroded chassis rail?
A: Do not use it to substitute for an approved structural repair or to conceal weakened metal.
Q: What preparation is required?
A: Expose sound material, key the supported margin and remove rust, loose coating, oil, water and dust.
Q: Is an open garage door enough ventilation?
A: Not automatically. Assess the exact safety sheet and provide effective vapour extraction without ignition sources.
Q: When can the repair be sanded?
A: Only after full through-cure under the actual temperature and layer conditions, not merely when the surface feels dry.
Q: How should sanding dust be controlled?
A: Use suitable extraction, respiratory, eye and skin protection and keep dust away from occupants and interiors.
Q: What should happen to leftovers?
A: Keep unactivated components sealed as directed and dispose of liquid or contaminated waste through the appropriate local route.
