What this industry manufactures
Gelcoat finishes the visible surface of FRP body panels for buses, tourist and staff coaches, commercial and utility vehicle bodies, and truck bodies — including insulated panel bodies for goods transport — applied to the mould before the structural laminate behind it is built up.
Why GP Gelcoat Resin is suitable
GP Gelcoat Resin's thixotropic body and high gloss finish suit the flat and gently curved panel moulds typical of bus and commercial vehicle body fabrication. It is not the structural material of the panel: glass fibre reinforcement wet out with GP Clear Resin forms the structural laminate behind it, often over a foam or honeycomb core for insulated panel bodies. Because transport body panels are exposed outdoors for the vehicle's working life, the same caution applies here as with any long-term outdoor gelcoat use: GP Gelcoat Resin has no UV-stabiliser package confirmed in its specification, which matters on a vehicle exterior. Where long-term outdoor colour stability is the requirement, the ISO Gelcoat grade is the one normally specified for surfaces facing weathering and outdoor service — compare the two on the gelcoat hub, and raise the expected service life and colour with the technical team before specifying either.
Required resin characteristics
- 01Thixotropic body suited to flat and gently curved panel moulds
- 02High gloss, smooth cured finish ready for the vehicle body without further finishing
- 03Pigmentable to match fleet or livery colours
- 04Room-temperature MEKP cure compatible with standard panel production
Manufacturing process
Gelcoat is sprayed or brushed onto the panel mould first and left to gel, then glass fibre reinforcement wet out with GP Clear Resin, catalysed with an MEKP hardener and cobalt octoate accelerator, is built up behind it — for insulated body panels, this is often laminated over a foam or honeycomb core. Once cured, panels are released from the mould with the gelcoat forming the finished exterior surface, trimmed, and fitted to the vehicle body frame.
Advantages
- Glossy, ready-to-fit panel surface straight from the mould
- Pigmentable to match fleet or livery colours in a single application step
- Thixotropic body suited to flat and curved panel mould shapes
- Consistent MEKP/cobalt cure across repeated panel production runs
Common products produced
- Bus and coach body panels
- Commercial and utility vehicle body panels
- Insulated truck body panels for goods transport
Frequently asked questions
No. It is the cosmetic exterior surface coating, applied to the mould first. The structural laminate — typically GP Clear Resin reinforced with glass fibre, sometimes over a foam or honeycomb core — is built up behind it.
Yes. GP Gelcoat Resin is supplied plain white, and FRP Polyester Pigment can be blended in before catalysing to match fleet or livery colours.
Not as a confirmed feature of its current specification. Since transport body panels are outdoors for the vehicle's working life, this matters here as it does for tank exteriors — for panels needing long-term outdoor colour stability, discuss UV-stabilised formulation options with our technical team before specifying.
No. This page covers buses, commercial vehicles, utility vehicles and truck body panels specifically. Motorsport and aerospace composite panels typically require specialised resin systems beyond general-purpose gelcoat and are outside the scope of GP Gelcoat Resin.
It is cured at room temperature with an MEKP catalyst (around 1.5%) and a cobalt octoate accelerator (around 0.4%), the same system used across Samrat Poly Resins' gelcoat and general-purpose grades.
Need gelcoat for your bus or commercial vehicle body panel production?
Get a bulk quote or talk to our technical team about the right gelcoat and laminate combination for your body panels.