Sanding discs with a pressure-sensitive adhesive (PSA) are easy to attach to your sander- simply peel away the backing and apply. They can be made from film, cloth, or paper, so you're likely to find a PSA disc that meets your budget and needs. The cloth and film-backed products are stronger and more tear-resistant, which is ideal for heavy-duty sanding, while paper-backed ones do a good job with lighter sanding and finishing jobs.

One thing to bear in mind with PSA discs is that once you remove them, you can't put them back on. This is where they differ from hook and loop systems. They are a better investment for larger jobs where you'll be using the same disc until it wears out.

ADVANTAGES

Available in a wide range of backing types, from paper to film

Secure hold during sanding

Meets most budgets

DISADVANTAGES

Can't be reattached after removal

CONCLUSION

When you're shopping for sanding discs, always consider which backing is ideal for your application. Paper may cost less, but it's less flexible and more likely to tear. Film backings are waterproof, so if you work in wet or marine environments, it will bring about the best results. When you sand uniquely-shaped pieces, cloth may be a better choice when you're at the finishing and polishing stages. Similarly, if you go through multiple levels during sanding, the hook & loop system is preferable to PSA, which is more cost-effective for larger pieces.