The nailpolish i use are made in China cost 1 euro for 15ml made of: ButylAcetate , Ethylacetate , Acrylates , Copolymer , Nitrocellulose , Alcoholdenat , Acetyl , Tributyl ,
Citrate , Isopropylalcolhol , Steralkonium , Hectorite. Used for locking, surface patching, coil surface repair etc and have not noticed any cracking after many years of use
for non vibrating surfaces. The mix ratio of these chemicals is not reported on the polish container.
Just did a fire test, painted a 10mm x10m area with the nail polish mentioned above on a piece of paper and set it on fire,
no extra or excess flaming occurred when the fire crossed the painted area. Larger thick surfaces perhaps react differently.