There is a misconception on 501...501 is a cleaner product..BUT also is a Sealant...it has great durability also...as good as 105...look..its for marine applications..for boats in water ...you need durability there...
I have used 501 as a stand alone product and also used it topped with Collinite for winter use and have it go all winter for me....
501 has great cleaning properties...it removes brake dust...road emissions from in the paint down to the micro pore level..its not layer able due to the cleaners....
it also has corrosion inhibitors in it...and its super slick to retard any water borne contaminants from sticking to the boat..
its best to let 501 setup before topping it with anything..it is a sealant....
I have used these toppers over 501 ..
105
111
jetseal...did not like it..
Collinite pastes...great combo for winter
Zaino Z5 and Z2 pros...and Z-CS spray
rejex
4* UPP
FireGlaze
Ultima
all give a little different look...
any topper should be done at least 12 hours after 501 is cured..it does crosslink.....
then I would AW after first wash.....since AW is a spray sealant..you do not want to have to many reactions going on at once...sealant curing and AW curing...so use after all sealants have cured...
for the OP..do the 501 one day..next day do the 601 and top with 105
this is just 501 on the paint after buffing it off...very glossy
now this is with a 105 topper the next day
Treat 501 as a sealant....
AL