corrado vr6
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| posted on 23/5/12 at 08:54 PM |
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calling all painters (keep sanding through primer)
Evening all, Im doing a respray of a mini and im at the filler primer stage and guide coating that back but i keep sanding through even after my
experience of doing a respray before where i sanded through i dont seem to have improved.
When i done a car last year i took a chance with some areas i had sanded through on and i had paint reactions where i have sanded back to the etch
primer!
Now obviously i dont want this to happen again so i was wondering can i filler/primer then guide coat that, then if i have sanded through is there a
primer i can put on that just literally needs smoothing off with out the need to go so mad flatting panels and to help seal the areas where i may have
sanded through the filler/primer
Any help/ advice will be most welecome as i feel like im hitting my head against a brick wall right now what with prime sand prime sand lol Thanks
Greg
http://r1indy7.wordpress.com/
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macc man
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| posted on 23/5/12 at 09:27 PM |
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If the primer is fairly even you should be able to get away with using a scotch pad to key the primer. Less chance of going through to bottom layers.
With unstable paint layers I use a sealer to isolate and prevent reaction with new paint.
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cliftyhanger
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| posted on 23/5/12 at 09:28 PM |
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How much primer are you putting on? I am guessing cellulose too?
I used to use double coats of filler primer, 400 wet/dry, another double coat and so on, usually 3-4 double coats then a proper flatting with 600
grade or finer. I have never used a guide coat, but the principle is the same.
remember celly primers do sand back VERY fast (2K much better but a bit harder work, and the health issues etc)
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corrado vr6
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| posted on 23/5/12 at 09:53 PM |
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so are you saying if i were to have used a isolator coat then if i did sand through i would not get paint reactions?
I basically found last time that the etch primer out of a can gave crazing like a spiders web, yes i have degreased and tack cloth wearing gloves i
was extremely thorough
im actually using 2K but dont worry im taking all the precautions!! i have applied 3 coats so far but when i sand through im applying more primer but
when i then sand again i end up sanding through surrounding areas obviously because i have sanded twice the amount on this area.
So im guessing theres no primer i can just put over the top as im only wanting to use maxmeyer filler primer to help aid getting the filler work as
straight as possible
Thanks again guys
http://r1indy7.wordpress.com/
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cliftyhanger
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| posted on 24/5/12 at 06:54 AM |
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If you have use an isolator then if you sand thriugh you must put more isolator on.
But I still dont understand how you keep sanding though. Unless the shape is too far off to be dealt with by filler-primer?
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Peteff
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| posted on 24/5/12 at 07:55 AM |
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You need an epoxy primer, don't bother with etch. You can fill over epoxy then rub back so you don't go through to bare metal, just google
it and you'll get lots of hits.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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tilly819
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| posted on 24/5/12 at 08:11 AM |
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Sounds like you are trying too hard to get it done quickly, you say you are using 2K, how many coats of primer did you put on and is it a high solids
primer?
Are you hand blocking or using some sort of power assisted sanger, DA etc? power sanders remove paint very fast!!
There should be no need to use a guidecoat providing you take your time, if you are using a guidecoat and still blowing through then you are
rushing.
I find it best to wet sand primer in a nice worm dry enviorment so the primer dosnt absorb any moisture. sand a tiny bit wipe off the water dont get
it compleatly flat (matt) on the first pass, get the whole panel to almost flat then do another pass to take off the last bit. be espeshaly carefull
on the edge of panels, this is were you will go through fastest.
hope this helps
tilly
F20C Haynes roadster 440 BHP/Tonne www.youtube.com/handmadeextreme
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