21 replies to this topic

[spud]

Hi All,

I've just started to respray my mini but I have a problem. I have started by spraying primer over the existing paint which has been wet and dry sanded to get a key and then panel wiped. However, on applying the primer I can see that in areas there are still small white dots (the original colour) where the primer has not adhered properly and sometimes this can be seen as long white rods. It looks like germs/amoebas in a petri dish surrounded by a grey dye :'(

I guess it's something simple perhaps I'm not leaving the panel wipe long enough to evaporate but the surface seems pretty dry to me -so any other ideas?

Any help appreciated,
spud.

[Retro_10s]

Are you totally sure the car is thoroughly de-greased??

you might find you have missed a couple of tiny areas when wet sanding, so there is still some glossy paint in some areas, rub the primer back and try flatting that area back again, then degrease thoroughly, and then try respraying...

[craig 1010cc]

Have you used any silicon based products in the area recently as that can really screw up a paintjob

[spud]

No silicon products used.

Strangely enough, I've just primered the roof and it's gone on very well with exactly the same preparation.
Though when I think about it I probably spent a tad more time sanding the roof than any other area. As suggested, if I flat down the problem areas again and respray it then hopefully the problem might be cured. Although now I come to think, there is an area in the boot which got a lot less attention and its gone fine.
I'll try to post a pic if I can.
Thanks for your help

Cheers,

spud.

[midridge2]

you dont leave panel wipe to evaporate, you put it on and wipe it straight off.
it could also apart from the above suggestions be too much thinners in the primer.

[spud]

Thanks Dude!!

I'll check more accurately next time.

spud.

[wobblybob]

scotch all the areas after uve flatted just to make sure its properly keyd

[spud]

Thanks for all the replies - I've taken note of all your inputs, I think the problem was that the primer to thinners ratio was too weak a mix.
Though I have gone over again the areas to spray.
I got a wonderful finish on the roof not bad for a complete novice

By the way, what is 'scotching'

Cheers,

spud.

[sqweaka]

Thanks for all the replies - I've taken note of all your inputs, I think the problem was that the primer to thinners ratio was too weak a mix.
Though I have gone over again the areas to spray.
I got a wonderful finish on the roof not bad for a complete novice

By the way, what is 'scotching'

Cheers,

spud.

its like the green square pads you use to clean the dishes with

[Woody]

Also when you flat the paint down wet , use a de-greaser in the water as this cleans as you flat down (we use washing -up liquid )

[pinch]

scotch pads come in a few different grades, contact your local paint supplier for advice and supply of them. they are brilliant. you can get some liquid to use with them which i guess you could describe as a rubbing compound maybe, which helps clean the panel as you go.

[mini-gti]

some peeps dip there scotch pads in panel wipe to thoroly clean the panel, i personaly dont because i find it gets to messy, but you can try this if you want, you'll want to use a purple pad i belive for flatting down before shooting primer

any decent paint supply shop will stock scotchbrite its a 3m product

gaz

[Flatcap]

Get yourself a Tac Rag as well, just to be on the safe side.

[mini-gti]

i always forget the simplest things

spose those sorta things are second nature, so i forget

gaz

[LITTLE MISS NAUGHTY MINI]

Also when you flat the paint down wet , use a de-greaser in the water as this cleans as you flat down (we use washing -up liquid )

does it matter which sort ?
or is fairy the best with longer lasting bubbles

Edited by LITTLE MISS NAUGHTY MINI, 10 November 2006 - 09:58 PM.