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Author Topic: Very upset  (Read 2333 times)

AlanP

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Very upset
« on: September 15, 2008, 06:24:45 pm »

There I was congratulating myself on a nice paint job on the superstructure, just a few holes to drill for vents, put masking tape on, marked holes, drilled holes, took masking tape off along with all the paint  :'(   Now this paint has been dry for about three weeks and I am sure that I wet and dried the plastic. So where have I gone wrong, perhaps I should have used a more coarse w&d as the paint does not seem to have keyed to the plastic.
I am now going back out to the workshop as I don't feel much like talking to her indoors, if there is a cat on the way I will kick it.

Please don't laugh as I am quite upset   

Alan 
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Sub driver

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Re: Very upset
« Reply #1 on: September 15, 2008, 07:14:24 pm »

Hi Alan,

Sorry to hear about you misfortune on the painting front , a few tips for you when you can face a repaint,

1) Please dont use masking tape its too harsh on the adhesive, use a good modelling tape ie Tamiya. Its designed for model use and is Low Tack. use a degreeser too before painting

2) You unfortunately have fallen into the trap of thinking that if you leave the tape on for a while until the paint hardens it will be better then remove it , you need to remove the tape after spraying / painting, just after the paint has gone off to the touch, this will stop it ripping the new paint.

You are certainly not on your own here buddy, its quite a common mistake.

 keep the faith  O0

Regards SUb.
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Stavros

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Re: Very upset
« Reply #2 on: September 15, 2008, 07:25:39 pm »

Hi Alan sounds as if you are right on what you have said,You should have used 180 grit wet dry, then primer,dust coat of balck as guide coat,600,or 800 wet dry,then top coat.
As regarding using masking tape to mark holes etc after painting NOTHING at all wrong in that,unfortuantly where you went wrong is in the prep stage,any probs pm me




Stavros
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AlanP

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Re: Very upset
« Reply #3 on: September 15, 2008, 08:35:11 pm »

Well the paint didn't take a lot of getting off, just used masking tape, I have removed all paint using 400 grit wet dry but will go over it again with 180 as soon as I can get some.
No cats on the way to the workshop, shame, may have to have a drop of medicine now to get over my trauma.

Thanks for the replies

Alan
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boatmadman

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Re: Very upset
« Reply #4 on: September 15, 2008, 10:08:59 pm »

Commiserations Alan - careful not to o/d on the medicine or you wont be able to sand in a straight line tomorrow.

Ian
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White Ensign

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Re: Very upset
« Reply #5 on: September 16, 2008, 02:38:58 pm »

Alan- just can say sorry... and welcome to the club. Had the same problem, cleaned the plastic with a toothbrush and rubbed it down, sanded, washed it again, sprayed, waited two days longer for drying, put a very smooth masking tape on and..... the words I want to use now are not allowed. Wouldn`t kick a cat anyway, but would be some of the lads who will be not biten by the dog, but they bite a dog anyway...

At this problem, get in touch with our well-known specialist STAVROS in this forum.
Any questions about painting? He`s the specialist to deal with.

If you don`t succeed- have a beer. If you succeed, have two.

Regards,
Jörg
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DickyD

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Re: Very upset
« Reply #6 on: September 16, 2008, 04:00:18 pm »

Did you use a primer before painting the final colour ?  :-\
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Arrow5

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Re: Very upset
« Reply #7 on: September 16, 2008, 05:10:21 pm »

The primer, preferably an "etch" primer, should go on the bare plastic/fibreglass before undercoat(s) surely.
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AlanP

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Re: Very upset
« Reply #8 on: September 16, 2008, 05:17:23 pm »

DickyD     Yes I did use a primer but as Stavros say's, and I suspected, the paint did not key to the plastic, so I have now got the right sized grit paper and after I have drilled the rest of the holes will have another bash at the painting.

Arrow    I thought etch primers are just for metals, my guru Stavros hasn't mentioned them   ;D

If this fails I think I will mail the parts to Stavros to paint  {-)

Alan
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Stavros

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Re: Very upset
« Reply #9 on: September 16, 2008, 06:06:07 pm »

you can use what halfords call a bumper paint which is supposidly for plastics yes I have used it but as I am in the trade I use the trade stuff


Stavros
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Arrow5

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Re: Very upset
« Reply #10 on: September 16, 2008, 07:56:01 pm »

The "etch" primer used for model aircraft coverings is specifically for polyester and similar heat-shrink plastic films.  Helps adhesives and paint adhere to these super-gloss coverings. There might be something for ABS. :-\   Low tack masking tape next time (Tamiya) O0
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polaris

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Re: Very upset
« Reply #11 on: October 20, 2008, 04:08:11 pm »


Dear All,

Whilst perfectly correctly someone said to use modellers tape, from good decorators suppliers you can get two diff. types of masking - normal and low adhesion. Just thought I would mention this.

Regards, Bernard
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