🛠️ Detailed Explanation of the Four-step Repair Method

🔍 Step 1: Locate the Leaking Point

Drain the water tank and wipe the surface dry.
Sprinkle flour or talcum powder, and water will leave marks.
Accurately determine the location of the crack to avoid blind repairs.

🧱 Step 2: Grinding and Roughening

Use sandpaper to grind at least 3cm around the crack.
Until the surface turns white and rough to increase the bonding area.
Use a scraper to remove debris and dust.

🧪 Step 3: Epoxy Resin + Fiberglass Cloth Reinforcement

Mix AB type epoxy resin glue in proportion.
Apply thickly on the crack, covering 2cm beyond the edge.
Cut the fiberglass cloth (5cm larger than the crack), soak it in resin and stick it tightly.
Apply 3 layers (horizontally + vertically + diagonally), and each layer must be compacted to remove bubbles.
The more layers, the higher the strength, but it should not exceed 5 layers to avoid excessive thickness affecting curing.

🛡️ Step 4: Waterproof finishing treatment

After the resin is completely cured (about 24 hours), apply two coats of waterproof sealant.
Strengthen the edges to prevent aging and cracking.

⚠️ Precautions & Test Pit Avoidance Guide

❌ Situations that are prone to rollover:

The construction environment is not right: the resin will not cure when the humidity is greater than 70%, and it cannot be operated on rainy days.
Insufficient material consumption: the resin is too thin to be sealed, and must be "thickly applied".
Test time is too early: wait at least 48 hours after repairing before adding water for testing.

🆘 Emergency alternative (temporarily effective):

"Nail-free glue + Coke bottle tablets" can be used to temporarily seal very small cracks.
For emergency use only, it is still necessary to repair it as soon as possible according to the standard method.

⚠️ What situations are not suitable for self-repair?

It is recommended to contact the manufacturer or professional maintenance personnel in the following situations:

Cracks greater than 5cm or structural deformation (bulge)
Multiple leaks (serious aging of materials)
Water tanks for drinking water (worry about the toxicity of glue)

📝 Summary

This repair method is suitable for FRP water tanks in non-drinking water systems, such as rooftop GRP water tanks, G cooling water systems, etc. For water storage devices with food safety requirements, food-grade materials should be selected or new water tank should be replaced directly.

If you have strong hands-on skills and complete tools, you can save hundreds or even thousands of yuan in repair costs!