6 replies to this topic

[davidh]

I hope no one has asked this before, a quick search didnt reveal anything. I recently bare metalled a door for the mini. then I cleaned it all with thinners. Then I sprayed on anti bloom primer, then cellulose topcoats. A few weeks later I was moving said door, and I knocked it against something and a large chip came out the paint, right back to bare metal. Why havent I got a good adhesion with my primer? And what do I do now? Am presuming its a bare metal all over again.

[Mephiston]

how did you take the old door back to metal - did you chem peel it or sand it - if you did it with chemicals it may not of had a rough enough surfice for the primer to stick too, how many coats did you do ? and how long did you leave them to dry in between - im not sure on times but with some paints i think it matters

[Retro_10s]

I would say the lack of Etch primer may well be the problem, also, did you degrease the bare metal thoroughly?

[Mephiston]

thats true if your going to paint on bare metal try and look for an acid etch primer- these kinda bite into the metal to make a good key for the next layer of paint - good for keeping away rust too

[davidh]

how did you take the old door back to metal - did you chem peel it or sand it - if you did it with chemicals it may not of had a rough enough surfice for the primer to stick too, how many coats did you do ? and how long did you leave them to dry in between - im not sure on times but with some paints i think it matters

was sanded with coarse paper to give a "key". A few weeks between primer and topcoat. 2 coats primer, 3 top.

Didn't use etch primer....thought you only used that on aluminium?

[Retro_10s]

was sanded with coarse paper to give a "key". A few weeks between primer and topcoat. 2 coats primer, 3 top.

Didn't use etch primer....thought you only used that on aluminium?

Nope, DEFINATLEY on Steel too! ESPECIALLY with mini's

Also, degrease the car before every coat of paint to be absolutely sure...

[Matt]

that was my first thought.. the paint isnt keying to the metal...

and now we know why