Fisheye problem

[iplagolf]

Hello...Re-finishing a set of cookie cutter wheels. Inside is black gloss, rim is gloss white. In the white I have several fish-eyes. I used etching primer, rubbed it down with denatured alcohol,and sprayed it. What do I need to do to get rid of them? Sand, prime and re-spray? Thanks in advance, Fritz

[962porsche]

fish eyes can come from many things ! most of the time is just bad prep work . other times it comes from the air supply its self . 1st the air needs to go thru a dryer or some type of desiccant system . once you know your air is clean and dry you can remove that as being a problem from the equation . then it's on to the prep . the 1st thing that should always be done is to wash the substraight down with soap and water . even if it looks clean you still wash it . dawn dish soap works best and is cheap . do not use a soap with any hand softener like with a lanolin oil in it . after it air drys then its time to wipe it down with a prebody work cleaner RM's 900 works well for that . then sand as needed , after every thing is sanded you then use a prepaint cleaner like RM's 901 cleaner . there are many types of cleaners out there and they all have there uses for the task of cleaning you need to do . it's not a good idea to use the wrong cleaner for what needs to be cleaned .
trying to use the wrong cleaner will bite you in the ass ! things like rubbing alcohol , reducers, thinners are all the very wrong things to use . if it does not state on the can that it's made for paint prep then its not !!!!! so don't even think about using it !!!!
most of the time things like alcohol just push things like oils into the substraight and not remove it .
when you do your prep work you wipe down a very small area with one very wet clean rag with the prepaint cleaner on it . before it drys using another very clean dry rag you wipe it off the substraight .
if your wiping down some thing like a hood or big panel like that you wipe a 1' x 1' area at a time when its clean you move on to the next 1' x 1' area . with some thing like rims it's about a 6" x 6" area .
as soon as the rags get dirty change them out for new rags . even if you think it maybe dirty change the rags out for new ones .
if your using a product like enamels cleaning is even more important because they are more susceptible to fish eyes . if its a enamel like out of a spray can times it by two .
any spray can is a wast of time and money . it has no hardener in it so on some thing like rims were you will use wheel cleaners the finish will not hold up for all that long . also brake dust eats into the finish over time . but if you like to repaint your rims every 2 or 3 years then go ahead and use it .
at this point if you have fish eyes then its a sand and repaint .
if you do start to see fish eyes when your painting DO NOT drive on more paint that will make it worst . pull the gun back and dust light coats on then let it flash for a long time an hour or so then spray on your wet coat .

[iplagolf]

962porsche...Thank you.

[drcoastline]

Hey 962,

I'm curios about the following, above you say "pull the gun back and dust light coats on then let it flash for a long time an hour or so then spray on your wet coat ."

I know this is going to vary depending on the product being used but, how long can you let a paint "flash" before you have to sand in order to re-coat?

Enamel w/out a hardener

Enamel w/ a hardener

A good quality 2 part product like Glasurit?

Thanks again.

Donovan

[vmisquez]

To me a wet coat a little more reducer added to "paint melt"

[962porsche]

you should never change the reduction of a product . if a paint co. state they want you to mix there product at a certain ratio always do so . if you increase the amount of reducer / thinner the product has a good chance to die back losing some of its shine .
a product like glasurit will have a much shorter wondow before you need to recoat it . about 30 to 40 minutes at most .
when it comes to enamel products you have a much longer window before you have to recoat it . with enamels you can wait about 2 hours at about 70 dergrees F. . it would be just a little longer if it's not hardened . about 2.5 hours or so at the same temp.
because of the time for all the solvents to evaporate there is a bigger window to recoat .
this is not to say it's ok to always give the flast time that long . you would only do some thing like this when you have to to try to save the job .
as you know fish eyes are from oils . it could come from you by not wearing gloves and handling a preped part .
it may come from your air supply .
it could come from just bad prep work and wipe down .
or it could come from all 3 ?
at times people will confuse fish eyes from solvent poping .they do look some what alike . solvent pops are most if the time very small in size . there are many causes for solvent poping .
putting on to many coats of product will cause them . if they tell you 4 coats max then thats the most you should spray on .
spraying on to heavy of coat at one time will also cause them .
not letting the product flash for long enough between coats will cause them .