I've painted FCR over Archer rivets before.  Just not long strips like are needed for the extra rivets for some SP and UP box/automobile cars. Put a coat of pledge over the rivets and let it dry for a day. 
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Ken Adams
Omicron BA2.2 may come and go but I still live mostly in splendid Shelter In Place solitude
Location: About half way up Walnut Creek
Owner PlasticFreightCarBuilders@groups.io