BEST WAY TO PROTECT 'V' DECALS ON AMI 'I'?

What is the best way to provide protective cover for the 'V' decal
water-slide transfers used on the sides of an AMI model 'i'. I've used
spray cellulose for the peppermint paint finish onto which I've applied
the transfers. I thought about just brushing over them individually
with a thin polyurethane varnish. Other option might be spraying over
the whole side panels with 'Clearcoat' - but is this a cellulose based
product which might destroy the V transfers? Thanks for any responses.