NFU.oh is far better than salon systems that's for sure,
It is hard to say what will make them last with out knowing what is happening when they are not lasting , are they splitting? Lifting , comming off whole , tips comming off , chipping at the free edge? There are a lot of ways nails can go wrong but when you know what went wrong you will know how to fix it
Some tips for making them last
Use good products , use the WHOLE system eg, don't mix diffrent brands monomers and polymers .
Prep
All Cuticle must be removed, or it will cause lifting.
If using tips be sure that they fit properly,
Nails must be sanitized / and dehydrated for this I always use CND scrubfresh no matter what system I'm using.
Your mix ratio must be right , to wet / to dry = nails that go bye bye .
Your bead placement , avoiding the eponychium and side walls , building a good apex and C curve , and making the product flush at the eponychium .
After care and following it. Solar oil as it plasticizes ,
Maintenance at the right time . Don't ignore lifting or brakes.