Concrete Casting – making concrete fishing sinkers

Concrete Casting is a category for anglers who want to approach the production of concrete fishing sinkers in a clear and systematic way. Concrete sinkers make sense especially where you are looking for a lead-free alternative to lead, want to keep the production process under your control, or need a custom solution for a specific fishing technique. It is not just about the mold itself – the mix, the fixing method, the insert or wire placement, and the final curing all play an important role.

In this category you will gradually find mainly concrete sinker molds, stainless spring inserts and wire for attachment points, and other gear connected to home production. Our molds are built for practical workshop use: robust construction, prepared fixing holes, the option to work with a stainless spring insert or wire, and clearly defined reference weights based on a specific mix. Smaller and mid-range weights are more universal, while heavier versions make more sense when specialised for particular fishing conditions.

Concrete fishing sinkers follow a different logic than lead. Concrete has a lower density, so the sinker will be bulkier at the same weight. That is not ideal for every standard casting situation, but it makes good sense for bait boat placement, use in current, on sloping bottoms, or in places where you need the rig to stay in position more reliably. That is why this category also includes heavier Grippa shapes, designed for specific situations rather than as a universal “one-sinker-for-everything” option.

The production process itself is also important. With concrete sinkers, the final result depends not only on the mold shape, but also on the density and type of the mix, water content, compaction and proper curing. Before pouring the mix, we recommend lightly treating the inner surfaces of the mold with a release layer so the finished sinker can be removed more easily. In practice, anglers often use a thin film of vegetable oil or a light spray oil. Depending on the mold type, the attachment point is created with either a stainless spring insert or a properly shaped stainless steel wire.

If you want to build your own production process properly, it makes sense to think of it as one complete system: mold → attachment point → mix → curing → final use. That approach makes it easier to choose the right weight, the right attachment solution and the right practical use for the finished sinker. That is what this category is about – not general construction concrete, but truly usable concrete fishing sinkers for real fishing applications.

• Lead casting • Soft bait making

Frequently Asked Questions – Concrete Casting

Does concrete casting make sense as an alternative to lead?

Yes, especially where you want a lead-free solution, want to produce your own sinkers, or need a specific shape for bait boat use, current or sloping bottoms. Concrete does not behave like lead, though – it has a lower density, so the sinker will be larger at the same weight.

Are concrete sinkers suitable for regular casting?

Smaller and medium weights may still make sense depending on the situation, but in general concrete sinkers are better suited to bait boat placement, specific applications or conditions where maximum casting performance is not the main goal. Heavy Grippa shapes make more sense in current, on slopes and where the rig needs to stay in place.

What mix should I use for concrete sinkers?

That depends on the specific mold and the required final weight. In general, a finer mix without coarse aggregate makes more sense because it fills the mold details better. For each product, it is important to follow the reference density the mold was designed for.

Do I need to oil the mold before pouring?

Yes, we recommend lightly treating the inner surfaces with a release layer. A thin film of vegetable oil or a light spray oil is commonly used. This helps when removing the finished sinker and reduces the risk of damaging the casting detail.

What should I use for the attachment point – a spring insert or wire?

That depends on the mold design and the sinker type. For smaller and medium molds, a stainless spring insert works very well. For larger or more specialised solutions, a properly shaped stainless steel wire can also be used.

Why are heavy Grippa sinkers in 300–400 g so specific?

Because they are not standard universal sinkers. These weights make the most sense mainly for bait boat placement, strong current, sloping bottoms and situations where the rig needs to stay firmly anchored in place.