Finding the right grit for your rock tumbler can be a daunting task, especially if you're new to the hobby. Hobby Lobby, a popular craft store, offers a selection of rock tumbling supplies, including various grits. This guide will help you understand the different grits available, how to use them, and what to consider when purchasing from Hobby Lobby or other retailers.
What is Rock Tumbler Grit?
Rock tumbler grit is an abrasive material used to shape and polish rocks in a rotary tumbler. It's essentially a progressively finer abrasive that smooths the rough edges of rocks over several stages. The process involves several stages, each using a different grit size. Think of it like sanding wood; you start with coarse sandpaper and gradually move to finer grades for a smooth finish. The grit is typically made from silicon carbide or aluminum oxide.
What Grits Does Hobby Lobby Carry?
Hobby Lobby's selection of rock tumbling grits can vary by location and stock. However, you'll typically find the standard grits needed for a complete tumbling process:
- Coarse Grit: This is the initial stage, typically around 60-120 grit. It's used to remove rough edges and shape the rocks.
- Medium Grit: Following the coarse grit, medium grit (220-400 grit) further refines the rock's surface, smoothing it out.
- Fine Grit: This grit (600 grit) continues the smoothing process, removing finer imperfections.
- Polish: This isn't technically a grit, but a polishing compound used in the final stage to bring a high shine to the rocks. Hobby Lobby typically offers various polishing compounds.
It's always best to check Hobby Lobby's website or your local store for their current selection and availability.
What Size Grit Should I Use?
The grit size you choose depends on the hardness of your rocks and the desired finish. Generally, the progression should follow a coarse-medium-fine-polish sequence. Using the wrong grit or skipping stages can lead to poor results. Starting with too fine a grit can lead to uneven polishing. Starting with too coarse can cause excessive rock damage.
How Much Grit Do I Need?
The amount of grit needed depends on the size of your rock tumbler and the number of rocks being tumbled. Always follow the instructions provided with your rock tumbler. Generally, you'll need enough to cover the rocks partially.
What are the Alternatives to Hobby Lobby's Grit?
Several other retailers sell rock tumbling grit, including online stores like Amazon and specialty rockhounding shops. These often offer a wider variety of grit sizes and types. Comparing prices and shipping costs is crucial when considering alternatives.
How Do I Use Rock Tumbler Grit Properly?
Using rock tumbler grit correctly is crucial for achieving the best results. Always follow these steps:
- Clean your rocks: Remove any loose dirt or debris.
- Add grit: Add the appropriate amount of grit to your tumbler.
- Add rocks: Carefully add your rocks to the tumbler.
- Add water: Add water to the tumbler according to the manufacturer’s instructions.
- Tumble: Run the tumbler for the recommended duration for each grit stage.
- Rinse: Thoroughly rinse your rocks after each stage.
What are the Different Types of Rock Tumbler Grit?
While silicon carbide and aluminum oxide are common, there are subtle differences:
- Silicon Carbide: Known for its sharpness and efficiency, excellent for harder rocks.
- Aluminum Oxide: A bit softer, generally preferred for softer rocks to avoid excessive abrasion.
By understanding these factors, you can choose the right grit for your rocks and achieve stunning results. Remember, patience and careful attention to detail are key to successful rock tumbling.
