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hi there i painted my car as i am a sprayer by trade and i spent 2 weeks prepping it and then primed it ,left it a couple of days ,blocked it down, re primed it.2days then blocked it down again and then re masked it and prepped it for topcoat .the car was baked 3 times in all but at a reduced temp.The car was then wet sanded with 2000 and buffed.Iwas pleased with the end result and it still looks superb 5 years on. prepping is the secret ,if it looks a bit dodgy in primer it will look worse in colour. use top quality paints ,don't be tempted by bargain paints. I used Glasurit and have been using thier paints for 15 years and have never had a problem,other brands such as PPG or Sikkens or Du Pont are also good products.to answer your question 12 weeks does seem a long time , you don't want the primer sitting around too long as primer is pourous and will draw water in ,this is not good in long run,can lead to micro-blistering.good luck dave
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