Hi,
we had a request to mount some antenna but the client require a camouflage of the antenna with the color of the roof (dark grey, dark red).
Anybody have some experience in painting anntenas like QRT, SXT or mAnt30 ?
Which paint is recommended to use ?
Can painting the antenna in dark colour, cause problem during the summer due to high temperature ?

check paints specificiations. aside being neutral chemically, environment and weather -resistant(including UV impact, rain, snow, ice, etc), it may be alteast moderately biologically-neutral/safe.
also part of specificication about radio transparency - usually not part of "basic" specificiation of paint, tend to be put into (short/compact)specification on can itself. so you must ask them (phone, e-mail) about "full scale data-sheet abot performance of their pait of desired colors, environment-resistance, etc" - stuff.
some paints are quite "army swiss knife", eg really resistant, not cause much radio loss, not toxic and not look awful or attractive, but they (sometimes)tend to be complicated and time-consuming to deploy.

I would not Metallic paint ?