What this industry manufactures
Water tank manufacturers produce bolted sectional panel tanks assembled on site from moulded FRP panels, one-piece cylindrical and rectangular shells, underground and overhead storage tanks, and industrial process-water vessels, ranging from small domestic capacities to large institutional and industrial installations.
Why GP Yellow Resin is suitable
GP Yellow Resin uses the same general-purpose orthophthalic chemistry and MEKP plus cobalt octoate cure system as our GP Clear Resin, so it wets out chopped strand mat and woven roving in the same way during hand lay-up. Its main practical difference is a thicker body (450–600 cPs against GP Clear Resin's 350–450 cPs) and a slower 10–15 minute gel time, which gives fabricators a longer open working window when rolling out reinforcement across a large tank panel — a genuine trade-off against GP Clear Resin's faster production cycle, not an improvement on it. Because the structural laminate inside a tank wall is rarely the visible surface once a tank is finished and installed, GP Yellow Resin's transparent yellow tint carries no functional downside here, making it a workable, same-purpose alternative wherever a fabricator prefers its slower-gelling grade.
Required resin characteristics
- 01Sufficient working time to roll out chopped strand mat and woven roving across large panel surfaces before the resin gels
- 02Reliable wet-out of glass reinforcement despite a thicker body than a low-viscosity laminating grade
- 03Adequate mechanical strength once cured, to withstand the hydrostatic pressure of a full tank
- 04Room-temperature MEKP/cobalt octoate cure with no special curing equipment required
- 05Consistent batch-to-batch quality across the multiple resin-and-reinforcement passes used to build up tank wall thickness
Manufacturing process
Tank panels or shells are built up by hand lay-up: chopped strand mat, often combined with woven roving for added strength, is placed against the mould, then GP Yellow Resin — catalysed with an MEKP hardener and cobalt octoate accelerator — is worked into the reinforcement by roller or brush. Its slower gel time gives fabricators extra time to work resin into each layer before moving to the next, and multiple layers are built up to the specified wall thickness. Once the laminate has fully cured at room temperature, the panel or shell is released from the mould, trimmed, and — for sectional tanks — bolted together with the other panels on site to form the complete tank.
Advantages
- Longer 10–15 minute gel time gives fabricators extra working time across large panel surfaces
- Same non-accelerated MEKP/cobalt octoate cure system as GP Clear Resin — no new dosing procedure to learn
- 225 kg drum packaging suits continuous production runs
- Consistent 99% purity for predictable batch-to-batch processing
Common products produced
- Bolted sectional panel water tanks
- One-piece cylindrical and rectangular storage tanks
- Underground and overhead water tanks
- Industrial process-water and raw-water storage vessels
Frequently asked questions
GP Yellow Resin is a general-purpose orthophthalic resin suited to the structural laminate of an FRP tank, the same role GP Clear Resin plays. For tanks intended to hold potable water, always confirm the complete construction — including any food-grade gelcoat or lining on the water-contact surface — meets the relevant drinking-water standards for your project; the resin's own colour does not affect this requirement.
There is no performance advantage — both are general-purpose orthophthalic resins with the same MEKP/cobalt cure. GP Yellow Resin is simply a thicker, slower-gelling grade with a transparent yellow tint rather than being colourless. Since a tank's structural laminate is rarely the visible surface once the tank is finished, some fabricators use GP Yellow Resin where its longer working time suits larger panel lay-ups, or as an alternative supply option to GP Clear Resin.
GP Yellow Resin is a general-purpose orthophthalic resin intended for standard water storage. For tanks holding aggressive chemicals or requiring higher corrosion resistance, a Vinyl Ester Resin system is the more suitable choice.
Tank walls are typically built up with chopped strand mat, often combined with woven roving for additional strength in larger tanks — the same reinforcement approach used with GP Clear Resin.
It is cured at room temperature with an MEKP catalyst and a cobalt octoate accelerator, the same non-accelerated system as GP Clear Resin. Its 10–15 minute gel time (against GP Clear Resin's under 8 minutes) simply gives fabricators a longer window to work resin into each reinforcement layer — the dosing and lay-up technique itself does not change.
Need GP Yellow Resin for your water tank production?
Get a bulk quote for GP Yellow Resin, or talk to our technical team about whether GP Yellow Resin or GP Clear Resin better suits your tank fabrication line.