Before buying a gel system, please think about how removing the gel might affect your damaged nail and nail bed. Will soaking in strong acetone for up to 20 minutes be painful? if so, avoid ALL gel systems like RCM. Proper soaking is essential or you will badly damage the nails during removal.
If you really want to go ahead with a gel system:
- Buff off the natural shine as lightly as possible if at all. Your gel might not last as long if you don't roughen the nail but you don't risk your natural nail health so much.
- Don't bother with applying gel colour. Just do several clear gel base/top coats and apply normal nail polish on top if you like. Then if the gel starts to chip you will be able to patch with normal clear base coat and not be tempted to pick off the gel colour which would be very very bad for the nail. The gel gives a lovely stable smooth base for normal colour so it looks good and lasts much longer than usual anyway.
- Good tip from Akimbo about tea bag bandages. I know vertical splits are more tricky but I've successfully grown out horizontal splits this way with gel on top to make it rock solid.
- Be really conscientious about applying cuticle oil several times a day. Elsewhere on this forum users have suggested soaking nails in almond oil after RCM to help restore moisture.
- Sensationail is easier to remove than RCM so needs less harsh soaking and it often comes off in one piece after a short soak so I think it's kinder to nails. It's a bit less faff than RCM because there is a single product for base and top coat whereas RCM has a base coat and separate top coat. The RCM base coat is thicker and can be difficult to stretch out to get a really thin even coat.
Some users have found gel systems give great results for a few weeks or months and they have great long nails. Then nails can suddenly become brittle and break and they are back where they started.
Consider a supplement like chlorella powder which can really boost nail health.
Good luck with whatever you decide!