Thorough Surface Preparation is Essential for Any Repair

Why Proper Preparation Is So Important

Resin repair products—be it fibreglass kits, putties, or specialist adhesives—rely on strong bonding to perform as intended. If the resin sheet is dirty, oily, or covered in old, failing material, the new repair may not fully adhere and could peel, crack or leak.

• Removes dust, dirt and loose particles that could weaken the bond
• Ensures maximum contact between the repair compound and the sheet
• Helps the final repair last longer and withstand exposure to water and impact

Steps for Effective Surface Preparation

Start by cleaning the damaged area of the resin sheet with soapy water and a non-abrasive cloth, then rinse and let it dry thoroughly. If necessary, gently sand the surface to remove gloss, old coatings, or weathered material—this provides grip for filling or resin products. For best results, always wipe the area with a clean, dry cloth just before applying your chosen repair compound.

If using a repair system like the Resin Fibreglass Repair Kit, careful preparation helps the polyester resin bond securely and keeps the repair strong and watertight.

When This Matters Most

Surface preparation is especially critical for structural or waterproof repairs, such as leaks in corrugated sheets on outbuildings, sheds or pool enclosures. Even tiny traces of grease or dust can affect the result, so thoroughness pays off whether you are applying fibreglass mats, epoxy putties or rapid set adhesives.