sealants will only give you a limited amount of shine tbh due to there make up as such and what they are designed to do which is to ultimatly protect,if your putting 915 over the top then surely you want a sealant that will have long durabilty rather than a glossy wet look?.
jetseal 109 goes without saying is a top contender, fk1000p a close second, cg M-seal , pb's ex-p.