For an off the shelf sealant - it's hard to beat Meguiar's Ultimate Wax as an all around sealant. It DOES NOT stain , is easy to apply / remove , gives decent protection and lasts at least 2 ~ 3 months - lastly the price is in line ... One of the few sealants also noted as being used by pro detailers and I can pick it up at any WM ! ... Perhaps best around , easy to obtain paint sealant (and ditto for the Meguiar's ultimate polish ) .
Based on repeated firsthand experience...we'd agree. It's one of the easiest to apply and gets some of the best results. They claim it lasts up to 6 months...but I never make it that long without doing another full detail (therapeutic
Recently tried (for the first time) the Chemical Guys Hybrid V7 Optical Select High Gloss Spray Sealant & Quick Detailer on top of it...and the shine is stunning...now have 2 layers of protection (including UV) as well.
The owner at the nearby hand car wash says my SUV is "at the top of all the vehicles he sees come in for a wash". He's asked me what products I use...and now he's using it too.