Top 5 Mistakes Collectors Make When Grading Cards in the UK
Grading trading cards is one of the best ways to protect, authenticate, and add value to your collection. But many UK collectors lose out on higher grades or delay their submissions because of simple, avoidable mistakes.
At SSINT, we’ve seen it all — from poorly packaged submissions to overlooked card prep. To help you maximise your results, here are the top 5 mistakes collectors make when grading cards and how to avoid them.
1. Not Preparing Cards Correctly
One of the most common errors is sending cards without proper protection. Collectors often use top loaders or tape, which can cause damage.
✅ Solution: Always use a penny sleeve inside a semi-rigid holder (available from SSINT here). This reduces pressure on the card and keeps it safe in transit.
2. Submitting Cards with Surface Dust or Smudges
Fingerprints, dust, and light scratches can bring grades down unnecessarily. These issues are easy to prevent but often ignored.
✅ Solution: Before sleeving, gently wipe the card with a clean microfiber cloth to remove particles and marks.
3. Misunderstanding Turnaround vs Value
Some collectors choose the cheapest service without considering the card’s value. High-value cards left in long queues risk market fluctuations.
✅ Solution: Use Express or Elite services for expensive cards you want back quickly. Standard is great for bulk or mid-value submissions.
4. Ignoring Security and Authenticity
Not all slabs are created equal. Paper labels can fade or be counterfeited, making buyers nervous about authenticity.
✅ Solution: SSINT’s laser-engraved aluminium labels and hand-finished authenticity badges ensure long-term security and trust.
5. Overlooking Non-Mainstream Cards
Many collectors only grade Pokémon or Yu-Gi-Oh!, leaving sports, Kayou, Card.Fun, and custom artist cards unprotected. This is a missed opportunity, especially as niche markets grow.
✅ Solution: Grade across your whole collection. SSINT supports sports cards, custom artist cards (Creative Legends Tier), Kayou, Card.Fun, and more.
Final Thoughts
Grading should increase confidence and value — not cause stress or regrets. By avoiding these common mistakes, you’ll protect your collection and get the grades your cards truly deserve.
At SSINT, our mission is to make grading secure, simple, and rewarding for every collector.
👉 Start your submission today and let SSINT help you grade smarter, not harder.