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help - paint reactions
smart51 - 23/5/10 at 12:40 PM

Sometime last year I pained a GRP panel in cellulose. I've had to modify the panel meaning there was a strip of filler around one edge and decided to repaint the whole thing. Having had paint reactions before, I machine sanded the whole panel with 120 grit then 240 grit and wet sanded with 400 grit. When it had dried I painted the entire panel with Barcoat and let it dry. I then painted it with cellulose putty then cellulose primer. Today Ive gone to flat the primer to find that there are crack in it down to the original paint. What can I do to stop the paint reaction.

I'm getting sick of this whole project to be honest. All the mechanicals took 7 months. The last 2 years have all been body work and the results are, well, rubbish. Added to that, my neighbour has hinted that she wants here garage back and I'm tempted to take an axe to the whole lot and put it in the skip. I'm not a million miles from finishing and at this stage, I just want to get it on the road.

Paul TigerB6 - 23/5/10 at 12:48 PM

Rub it right back to bare fibreglass and paint from scratch using primer, basecoat and 1K laquer. Get all your paint from a single supplier and take all the advice they will surely give you if you ask to ensure you have the right primer for the material.

RK - 23/5/10 at 12:49 PM

Mine has been one little thing after another, and doesn't end. The attempts to get it on the road haven't been successful either. Right now, I'm trying to get the nosecone to look half decent, without a lot of success there either.

Maybe it would do to farm out the painting, since it's only a few panels anyways. It may save a lot of aggravation, and not cost a fortune.

jambojeef - 23/5/10 at 02:15 PM

Only way I found when having this with a m'bike a few years ago was to use a blocking layer of somehting that the paint shop gave me.

Do a search - it seemed to be the only thing that worked, sorry I cant remember the name of it.

Geoff

smart51 - 23/5/10 at 02:22 PM

quote:
Originally posted by jambojeef
..use a blocking layer of somehting ...


I did. It's called barcoat.

I was so hacked off with it, I've just been out and put a smear of filler in the cracks and sanded back so the filler is translucent but not quite gone. I've put a coat of colour over the whole panel and now it is touch dry there are no cracks. I'll see what its like in an hour, otherwise I'll be sharpening the axe.

iank - 23/5/10 at 03:36 PM

Why not take it to MSVA as is (well with any of the mechanical jobs done). Paint doesn't have to be perfect to get it on the road and that might put you in a better frame of mind about the whole thing.

flibble - 23/5/10 at 03:55 PM

Having had similar problems before I'm thinking a vinyl wrap is the way forward..

smart51 - 23/5/10 at 05:47 PM

quote:
Originally posted by iank
Why not take it to MSVA as is


That's exactly what I'm thinking but bare patches look a bit unfinished and don't exactly set the tone well. I've forgotten all about paint quality at the moment but getting it all one colour is proving difficult

The nose now has 2 coats of colour and it has all stuck so I'm leaving it at that for now. Only 1 more panel to go and that is all in the filler so no paint to react.