sand
coat with thinned linseed oil but the linseed attracts dirt
maybe clear something-a clear latex!!!! ahhhhhhhhhhhhhhhh clear latex.
linseed is essential wax for chips on a steel frame-axle
ends+nuts-dropouts
spokes flex and paint flakes!
inn fact, an expoeriment to paint with dayglo marking paints(a
negative) showed paint 'tileing' as on a dry lake or mud hole skim from
the paint over chain stays
that flex but much less than spokes off course