GemRockEST. 1993
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Fibreglass & GRP repair

Damaged fibreglass? We repair it.

Cracks, holes, leaks, delamination and worn gelcoat — on industrial plant, buildings, boats and vehicles. We repair on site or in our workshop. GemRock has engineered fibreglass since 1993.

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4Repair sectors
On siteor in our workshop
Est. 1993Fibreglass engineering

On site or in our workshop. Fixed plant, roofs and pools are repaired where they stand. Anything that can travel can come to us.

Engineering fibreglass since 1993
How it works

Three steps from damage to repair.

  1. 01
    Tell us what's damaged
    What it is, what has happened and where it is. A short description is enough to start; photos help.
  2. 02
    We assess it and quote
    How far the damage goes, what the item is made of and how it can be reached all shape the repair, so each job is quoted individually.
  3. 03
    The repair is carried out
    On site or in our workshop. Damaged material is cut back to sound laminate, rebuilt with new glass and resin, then finished to match as closely as the existing surface allows.
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Common damage

Recognise the problem?

These are the usual ways fibreglass gets damaged or wears out. The sector pages go into more detail.

Repairs by sector

Cracks & crazing

Fine gelcoat cracks from flexing, impact or movement, through to fractures that run into the laminate beneath.

ALL SECTORS

Holes & impact damage

Punctures, crushed laminate and torn panels. The damage behind is often larger than the hole you can see.

ALL SECTORS

Leaks

Tanks, bunds, basins, roofs and pools that no longer hold or shed water — usually at cracks, joints, outlets and pipe entries.

INDUSTRIAL · HOME & BUILDING

Delamination & soft spots

Layers of laminate, or a skin and its core, coming apart. Often felt as a soft, spongy area, or heard as a dull sound when tapped.

MARINE · VEHICLES · ROOFS

Blistering & osmosis

Blisters under the gelcoat, caused by water getting into the laminate. Best known on boat hulls; also seen in pools.

MARINE · POOLS

Faded, chalky or worn surfaces

Sunlight breaks down gelcoat and topcoat over time, leaving a dull, powdery finish that can often be polished back, or recoated.

ALL SECTORS
Where the work happens

On site, or in our workshop.

Which one depends on the item and the repair. Not everything can be moved, and not every repair can be done in the open.

On site

For things that can't travel: cooling towers, tanks and bunds, flat roofs, pools, fixed cladding and walkways, and larger boats and vehicles. Resin needs dry conditions and a workable temperature to cure, so outdoor work is planned around the weather.

Tell us where the item is when you enquire.

On-site coverage area: to be confirmed · placeholder

In our workshop

For anything that can be brought to us: doors, panels, planters, small craft, jet skis, caravans and removable parts. Working under cover keeps rain, dew and frost away from a repair while it cures.

Workshop address: to be confirmed · placeholder
How a repair is built up

A structural repair is new laminate, not filler over a crack.

Fibreglass is layers of glass reinforcement bonded in resin, usually under a gelcoat — the coloured outer layer that keeps out moisture and sunlight. When the laminate itself is damaged, a repair has to put that structure back.

  1. 01Assess. What the item is made of, how far the damage runs and what caused it. Some damage only shows in full once the area is opened up.
  2. 02Cut back. Loose, cracked or wet material is removed until sound laminate is reached.
  3. 03Taper. The edge is ground to a long taper, so new material overlaps the old across a wide bond instead of meeting it at a butt joint.
  4. 04Rebuild. New glass reinforcement and resin are laid up in layers to restore the thickness of the original.
  5. 05Fair and finish. The repair is faired, then finished in gelcoat, topcoat or paint, matched as closely as the aged surface allows.

Surface-only damage — chips, scratches, chalking — is dealt with at the surface, without rebuilding the laminate.

Repairs by sector
LAMINATE REPAIR · SECTION CUT BACK TO SOUND LAMINATE NEW PLIES OVERLAP THE OLD ACROSS THE TAPER 1 GELCOAT 2 TAPERED EDGE 3 NEW LAMINATE 4 ORIGINAL LAMINATE GEMROCK REPAIRS DRG GR-RP-001 TAPERED REPAIR ILLUSTRATIVE · NTS ILLUSTRATIVE · NOT TO SCALE
  1. GELCOAT
  2. TAPERED EDGE
  3. NEW LAMINATE
  4. ORIGINAL LAMINATE
1993
Established
30+
Years engineering fibreglass
4
Repair sectors
2
Ways to work · on site + workshop
Why GemRock

We know how fibreglass is made, because we make it.

GemRock has engineered and manufactured fibreglass in-house since 1993. Today that includes cooling towers, doors and components for industry and defence. A repair draws on the same materials and the same skills: reading a laminate, choosing a resin, building up glass and finishing a surface.

Engineering fibreglass since 1993 About GemRock
We also manufacture
Fibreglass doors & plantersFor the home Cooling towers & componentsFor industry Defence & securityBy enquiry Manufacturing overviewSee all
Before you ask

Four questions we can answer now.

Do you come to me, or do I bring it to you?

Either. Fixed items are repaired on site; things that can travel can come to our workshop. Tell us where the item is when you enquire.
On-site coverage area: to be confirmed · placeholder

How much does a fibreglass repair cost?

It depends on what the item is, how far the damage goes, how it can be reached and the finish required, so each repair is quoted individually and we don't publish a price list. A description and a few photos are the best starting point.

How long does a repair take?

It varies with the size of the repair and with curing: how resin cures depends on temperature and moisture. Ask for a timescale when you enquire.

Will the repair match the rest of the surface?

Colour and finish are matched as closely as the existing surface allows. Gelcoat fades and weathers with age, so an exact match to an older surface can't be promised.

More repair questions

Tell us what's damaged.

Describe it, tell us where it is, and we'll come back to you about a repair.

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