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Old 08-03-21, 09:45 PM
Pugsport Pugsport is offline
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Join Date: Nov 2011
Posts: 499
Quote:
Originally Posted by dipzy View Post
I'll try attempt it on a small piece like a solid PCI slot or something and see how I get on
just make sure you remove the old paint mate, as powder coating is not the best thing to paint over.

you can remove the old paint with some sandpaper, paint stripper/chemicals or with something like a poly strip disc. if your going down the paint stripper/chemicals route make sure you clean it off well afterwards by washing it with soap and water drying it and then use some panel wipe to clean the surface again just before painting it, once cleaned with panel wipe before painting try not to touch it with you bare hands as this can leave oils from your skin on the part.

if your going to be sanding the paint off dont go to course with the paper on aluminium parts as you'll find it hard to get the scratch marks out. id recommend using P180 if your going to painting it with a spray gun or if not id go with some P240 if your going to be using rattle cans

once you have the part back to bare metal you'll need to use a primer that will adhere to the bare part. im going to take a wild guess that the pci slot cover is going to be metal rather than plastic so you'll need a wash primer (2k) etch primer (1k) or epoxy primer (2k) apply two full wet coats of your chosen primer then you can apply 2 more coats of a standard primer over this. you'll want to apply your first coats of each primer light to give the second coat something to grip to as the second coat you'll want to apply a little heavier to get coverage, allow 10 to 15 mins between coats or as recommend on the paint can. this allows most of the solvents to evaporate before you apply the next coat

the next stage depends on what type of finish you are looking for, if you want the standard type case finish (orange peel/textured look) then just apply your colour straight over the top of the standard primer or if you wanting a glass finish to the parts you'll need to sand the primer smooth before applying the colour (base coat) id go with P320 if your using a paint gun or P500 if your using spray cans.

applying base coat you'll want to again do your first coat thin (mist coat) to allow the second coat something to grip to, second coat will be a heavier coat and normally 2 or 3 coats is enough for even coverage but if not just apply another coat till your happy its covered, leaving your 10 or 15 mins between coats or as it says on the can

once you have the base coat down and your happy with it you'll just need to apply your clearcoat/lacquer, dont sand the base coat unless you get a run mark in it or some dirt but make sure its dry before you sand it. you'll want to apply 2 or 3 coats of lacquer in the same way as you have done before

on larger parts it pays to lay down your first wet coat and then the second wet coat apply at 90 degrees to the first coat (so your painting across the first coat) this helps to get even coverage across the part and generally means less coats are needed.

if you need anymore advice mate dont hesitate to contact me or if people would like id be happy to make painting guide that people can follow

if you sand between coats you should easily be looking at a finish like this (this has some dirt in it as it was sprayed in my shed at home)
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