SurfPrep 400 grit sanding sheet uses SurfPrep's modified open-coat aluminum oxide grain, so each pass cuts while leaving a fine surface ready for finish sanding on woodworking jobs. The sheet uses a film backing, which supports a consistent finish and a faster rate of cut during repeated passes. A sacrificial stearate coating on the abrasive grain minimizes loading, so the cutting action stays more uniform over more strokes. The 3 inch by 4 inch size matches SurfPrep's 3X4 format, giving coverage suited to small panels, edges, and profiles where control matters. Hook and loop attachment lets the sheet grip compatible pads firmly yet release when grit changes are needed, supporting an organized workflow on sanding stations. The 400 grit rating positions this sheet for fine surface preparation where a smooth result is required before moving to finishing steps.
The 3 inch by 4 inch SurfPrep sheet matches SurfPrep's 3X4 format, so dimensions align with typical SurfPrep 3X4 sanding pads for controlled coverage. The hook and loop design allows the sheet to mate to hook and loop style pads, helping the abrasive stay positioned while sanding flat faces or edges. Film backing keeps the sheet stable across the pad surface, which supports even contact as the pad moves across cabinet parts or trim pieces. The 400 grit rating suits fine sanding steps where the goal is to refine previous sanding marks and prepare surfaces before finishing work. Tear resistant film helps the sheet stay intact when used along joints or edges, reducing interruptions to replace torn sheets during these finer stages.
The SurfPrep aluminum oxide film sanding sheet with part number SP3X4HLF400 is built on a 3 inch by 4 inch film backing, positioning it for use on SurfPrep 3X4 sanding setups in cabinet and woodworking environments. The modified open-coat aluminum oxide grain cuts while leaving a controlled scratch, so 400 grit work can be applied when dialing in final surface quality on panels, face frames, or trim. The sacrificial stearate coating minimizes loading, which supports steady performance on woods that tend to generate fine dust. Hook and loop attachment allows this sheet to be used where quick swaps between grits are part of the workflow, especially when moving from coarser SurfPrep 3X4 sheets to this 400 grit step.
The film backing on this SurfPrep 3 x 4 film sanding sheet provides a stable base for the aluminum oxide grain, helping the abrasive stay flat over the pad so scratches remain consistent from edge to edge. That stability, combined with the film's support for a faster rate of cut, lets installers move efficiently through fine sanding passes without needing multiple tools for the same area. Tear resistant film construction resists damage as the sheet runs across corners or along edges, which means fewer sheet changes during detail work. The sacrificial stearate coating plays a role by minimizing loading, so dust is less likely to clog the abrasive and slow cutting. Together, the open-coat grain, stearate coating, and film backing support repeatable, fine sanding performance in finishing stages.
The SurfPrep 400 grit sheet uses SurfPrep's modified open-coat aluminum oxide grain, which provides cutting action with space between particles to help manage dust during sanding.
The film backing provides a stable, flat base under the abrasive, which supports a consistent finish and a faster rate of cut across the 3 inch by 4 inch sanding area.
The sacrificial stearate coating on the SurfPrep sheet minimizes loading, so dust is less likely to stick to the abrasive and the sheet maintains cleaner cutting performance.
The 400 grit rating places this SurfPrep sheet in the fine sanding range, so it is suited to finish sanding steps where a smooth surface is needed before subsequent finishing processes.
The tear resistant film construction helps the sheet stay intact when working edges or corners, which supports longer use per sheet during detailed sanding tasks.
This SurfPrep aluminum oxide film sheet is 3 inches by 4 inches in size, aligning with SurfPrep 3X4 sanding setups that use this compact rectangular footprint.
The SurfPrep 400 grit sanding sheet combines modified open-coat aluminum oxide grain, a film backing, and a sacrificial stearate coating, so it supports fine sanding steps in woodworking environments. Its 3 inch by 4 inch format and hook and loop design align with SurfPrep 3X4 sanding workflows where controlled coverage and quick grit changes are part of daily work. Tear resistant film construction supports longer use during detail passes, which helps maintain steady progress through finishing stages when smoothing cabinet parts, panels, or trim.
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