Couple days ago I walked in a local stationary store and asked to the clerk a "Colorgin" rattle can of matte white. Actually I saw the can in the shelf and pointed him what I wanted. Colorgin is a Brazilian reliable paint maker so I knew that it is a good stuff. Then the stupid clerk instead to pick the can and sell to me, decided to ask:
-- Wouldn't you like to buy this other one? It's cheaper and I tried it the other day and it is awesome!
He told this while he put the mysterious and yet good looking can onto the counter. What I was thinking to trust his "I tried it and it's awesome" opinion?
OK, then the stupid me said "OK, I will buy this!".

Today I brought two half nacelles of my Reliant to the shop, shook the rattle can (c'mon it's just white...) and sprayed it. Immediately I noticed that regardless the label in the can say "matte white" it's gloss. A few minutes later after a couple coats I could see that the surface was with an awful orange peel texture. I almost pee in my pants: several years ago I tried to paint a model car with a red rattle can and I got the same orange peel that for my horror wasn't the paint but the plastic that was attacked by the solvent (the model was ruined and had to be dumped).

I then ran back to my workbench with the nacelles, picked a rag, damped it with spirit thinner and spent about 1 hour rubbing the nacelles to remove the whole paint. Fortunately it didn't damage the plastic (Hurray, AMT!) but I wasted a lot of time and it could not have been end so happily.

The lesson learned here is: never EVER trust in the opinion of a store clerk unless you know that he/she is a trained and experienced specialist. Other than that he or she is there just to pick the stuff in the shelf, get the money and give the stuff to you. Everything with a smile.
