I used Sikkens Filter 7 on my Sapelle French doors ... doesn't crack, and
good for at least 2 years - and takes very little to recoat, just quick wipe
over with fine wire wool, wipe down with meths and recoat - goes on much
faster than paint.
I actually used a base coat first to even colour - you paint this on then
wipe it off with a rag while wet.
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