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Author Topic: paint lifting  (Read 1662 times)

colin-stevens

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paint lifting
« on: March 05, 2008, 05:57:53 PM »

got a resin moulding. made myself. it was left to dure for quite a while. rubbed down. sparayed with Halfords filler primer. detail added, with cyno. resprayed with Hafords primer. rubbed down, resprayed, rubbed down. finallly got a smooth finish, and the detail blended in nicely. then i noticed that in places the paint cracked. i could then peel the paint of, and the detail. decided to rub all the paint of, back to the resin.
How can i avoid this happeneing again? kind of hacked off.
colin
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Martin [Admin]

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Re: paint lifting
« Reply #1 on: March 05, 2008, 07:17:28 PM »

I had a problem like that when building Jan's Puffer, turned out to be oil  / dirt from my own fingerprints!  >:(
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colin-stevens

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Re: paint lifting
« Reply #2 on: March 05, 2008, 07:25:10 PM »

yer, but i had well washed it.
and handled it to a minimum once washed.
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John W E

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Re: paint lifting
« Reply #3 on: March 05, 2008, 07:37:18 PM »

Hi there Colin, what type of resin did you use, as some specialised resins contain a form wax.

aye
john e
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colin-stevens

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Re: paint lifting
« Reply #4 on: March 05, 2008, 08:18:50 PM »

was wondering on wether i had left some wax on.
bog standard resin i think, but i do seem to have a very polished finish, even after rubbing down for the last week.
seem cyno hasnt stuck either, i will try gluing another peice of detail on and see if that stays
oolin
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John W E

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Re: paint lifting
« Reply #5 on: March 05, 2008, 08:59:32 PM »

hi ya there Colin, you could try washing the area down with Acetone.

This may also give you a good etched surface to paint upon if you allow the acetone to evaporate from the surface.   The surface will become tacky or should become tacky for a while.

aye
john e
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colin-stevens

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Re: paint lifting
« Reply #6 on: March 05, 2008, 09:13:06 PM »

will give that a go, was on of my plans.though not easy for me to get. the other was meths, if that fails, i can always drink it. drown my sorrows
good health
colin
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John W E

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Re: paint lifting
« Reply #7 on: March 05, 2008, 09:18:19 PM »

Hi ya there Colin, methylated spirit not quite as good, because the resin will have already hardened whereas Acetone chemically attacks the resin.   Good luck.  No drinking that Meths mind - whisky cheaper  :) :)  Colin what release agent did you use for the mould?

aye
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Stavros

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Re: paint lifting
« Reply #8 on: March 05, 2008, 10:32:01 PM »

Colin I personally think as well that the resin is contaminated with wax now the bets thing you can do with this is to go and find a paint supplier and buy a Gallon of either spirit wipe also known as panel wipe and wash the parts off in this.I know a gallon is a lot but it is usually sub £10 and it goes very far.If you are painting anything really you should be using this product,it is the ONLY known product that will degrease prior to painting.This is used by EVERY bodyshop prior to painting a vehicle.IT DOES WORK.You read every kit ins and they say wash the hull In warm soapy water prior to painting what a load of baloney,panel wipe is the way to go.


Stavros
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White Ensign

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Re: paint lifting
« Reply #9 on: March 11, 2008, 07:05:23 PM »

Colin, as Stavros said- in the most cases it`s the release-agent which is not washed down. I`ve had a similar case, where I just used wax as a release agent. Some of the wax was "locked" in the mould and no matter how hard I tried, always had some spots where the colour peeled off.
Since I use PVA (Polyvenylalcohol) after waxing I`d never had a problem again. Just wash it with soap-water and a hard brush and you`re free of any release- rests.
The stuff recommended from Stavros is also new to me, but it doesn`t mean anything as I bet it`s not available in germany either.

Best way now (might sound a bit hard) is to wash down all the paint with the recomended panel-wipe and start brandnew.

Hope that was out of help anyway,
Jörg
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Stavros

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Re: paint lifting
« Reply #10 on: March 11, 2008, 07:16:45 PM »

Jorg it is available in Germany go in to any car repair shop where they spray cars and ask them what they use to degrease prior to painting.It is probably called something totally different out there but I gauarantee you they will use a degreaser.

Stavros
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colin-stevens

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Re: paint lifting
« Reply #11 on: March 11, 2008, 07:18:52 PM »

Cheers guys. Done what Stavros reckomended and got myself down to a paint shop and bought a product called Antisill 770, small can. There were two other products, both sold in 1 gallon cans. Probably evaporate before i used it. Hopefully its done the trick.
Thanks all
colin
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