Fibreglass Filler

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(6 Results)

Gelcoat Repair Filler 400G Gelcoat Repair Filler 400G BLA-261216

$49.31 $51.90

$2.59 off RRP of $51.90

Septone Putty Fibretough R/Forced 500G Septone Putty Fibretough R/Forced 500G BLA-261234

$63.90

Putty Stik Epoxy Steel 56.8G Putty Stik Epoxy Steel 56.8G BLA-261450

$22.90

Putty Stik Epoxy Water Weld 56.8G Putty Stik Epoxy Water Weld 56.8G BLA-261452

$28.90

Putty Stik Epoxy High Heat 56.8G Putty Stik Epoxy High Heat 56.8G BLA-261458

$33.90

3M Filler Platinum Plus 01131 3.8L 3M Filler Platinum Plus 01131 3.8L BLA-268406

$132.91 $139.90

$6.99 off RRP of $139.90

Fibreglass filler is used for fairing, patching and shaping repair areas on suitable boat surfaces before sanding and finishing. Product choice depends on repair size, substrate, cure requirements and the final coating system. Follow manufacturer instructions carefully and avoid assuming one filler suits every repair. For larger, structural or uncertain damage, get qualified advice before starting work or selecting repair materials, and check compatibility with surrounding coatings, primers, finishes, sanding steps, masking needs, tools and preparation products before careful use.

Choosing fibreglass filler for boat repairs

Consider whether the job is a small surface fairing task, a deeper repair preparation stage or part of a larger fibreglass project. Surface preparation, mixing, sanding and cure conditions all affect the result, so check the product directions before starting. Some fillers are formulated for a specific substrate or coating system, and using the wrong type may affect adhesion or finishing results.

Repair preparation and finishing

Fibreglass filler often sits alongside broader marine fibreglass repair, compatible marine resin, finishing products such as marine gelcoat and masking and prep items like marine masking tape. For structural or uncertain repairs, seek qualified advice rather than relying on filler alone.

Surface preparation before application

The area to be filled should be clean, dry and free of loose material, wax, oil or contamination before application. Poor surface preparation is a common cause of adhesion failure regardless of filler type. Sand back the edges of the repair to a feathered profile where required by the product instructions, and check whether a primer or laminating resin is needed before applying filler over the substrate.

Sanding, finishing and product compatibility

Different fillers have different sanding characteristics and working times. Check product directions for recommended sanding stages, grit progression and whether the cured filler is compatible with the intended topcoat or gelcoat. Applying an incompatible coating over uncured or contaminated filler can cause adhesion and finish problems that are harder to correct than addressing them during the preparation stage.