New paint peeling off ...

Stephen Hull stated correctly in a previous post "Don't use cellulose thinners unless your wiping over original factory baked paint otherwise you'll wipe the paint off instead of cleaning it".

So DO NOT WIPE THE SURFACE WITH THINNERS UNLESS YOU WANT TO GET RID OF THE DIY SPRAY PAINT

Apart from the other info given with reference to preparation etc.

Compared to a conventional spray gun system aerosols contain very thin paint under very low pressure which when applied does not adhere very well, also the paint does not always atomize correctly and more often than not the applied finish ends up far too dry. A dry coat lacks adhesion so you need to provide an alternative key by way of preparation and priming.

The first coat of primer is the most important layer of paint as it has more than one function to perform, It must BOND to the surface with enough strength to allow additional coats to be applied over the top and allow sufficient movement for expansion and contraction of the surface. The entire painting system or process depends on the priming coat it is therefore in the interest of the painter to use a good quality primer designed specifically for the job in hand.

A full wet coat cannot be done successfully using aerosols because the paint is supposed to soften the inner paint layer so you can build up layer upon layer with each coat softening the other so you end up with a solid film BONDED right through. You can't achieve this with aerosol paints, you have to first establish a suitable key for the primer to bite on then the subsequent coats will melt into each other.

99% of the time aerosol paint just sits on top without a suitable key or adhesion.

You should be able to pressure wash a paint surface without it lifting off if it's been prepared properly and this included synthetics.

Steve.

dave F ( snipped-for-privacy@btinternet.com) gurgled happily, sounding much like they were saying :

Umm, I was suggesting he wiped it over BEFORE spraying to clean the surface to stop the paint falling off again.