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Thread: 3M Painters Blue masking tape and acrylic paint don't mix?

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    Default 3M Painters Blue masking tape and acrylic paint don't mix?

    Had a bad experience with using Scotch/ 3M Painters Blue masking tape (1 inch wide). I used it to mask the backdrop on my layout when working on ground right in front of the backdrop. The backdrop is hardboard (same stuff they make peg board with but no holes) painted with acrylic craft paint. It had been painted months if not years ago. When I removed the tape it took off many parts of the paint as seen in the second photo. Maybe I should spray a fixative over the rest of the backdrop?
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    Oh well, live and probably forget until next time.
    LOL.
    Cheers!
    Maurice
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    How did you prep the hardboard when you painted it? As smooth as it is you sometimes have to prep it. I wipe it down with Mineral spirits first before painting. Jim

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    @Maurice

    If the backdrop is on what I think it is on then if the surface of the "Peg Board" was smooth and shiny acrylic paint most likely wont adhere to it properly. The shiny smooth surface should be roughed up a bit with fine sand paper, say 1200 or 1600 grit so as not to "gouge it" then primed.

    If what you used isn't what I am thinking, then disregard the above
    Cheers Tony

    "Knowing what to do is one thing ... being able to do it is another"
    "It is easy to criticize ... a lot harder when you have to justify it"

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    I wouldn't use mineral spirits (oil based) as a wipe before painting with acrylic (water based). But a wipe with a damp cloth before painting might let the acrylic adhere better.

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    You should remove masking tape as soon as your paint dries, preferably the same day you applied the tape. 3M lists the "clean removal times" here for each of their brands of tape but other mfg's tapes have the same issues; as the gum hardens up it either peels off of the tape or peels the paint off of the painted item. http://multimedia.3m.com/mws/media/7...oduct-info.pdf

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    Painting 101: Hardboard needs to be primed before painting, or you definitely will risk the top coat not adhering.

    And blue painters tape shouldn't be left on for any longer than the manufacturer recommends, minus two days as a safe margin.

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    Quote Originally Posted by Maurice View Post
    It had been painted months if not years ago. When I removed the tape it took off many parts of the paint...
    Was the tape left on as long? If so, that's your issue. You should remove the as soon as the paint is dry, as others have said. Left on for a long time the adhesive often reacts with the substrate.

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    I always remove any tape the moment the painting is done, well maybe a few minutes , but never longer then 10 minutes.
    As long as I can model in N-scale, I know I'm not old

    My Flickr Pages

    http://www.janbouli.com

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    Thanks for all the replies!
    Quote Originally Posted by nicki6 View Post
    How did you prep the hardboard when you painted it?
    Just wiped it off with a clean cloth and cleaned up the edges.

    Quote Originally Posted by wombat457 View Post
    If the backdrop is on what I think it is on then if the surface of the "Peg Board" was smooth and shiny acrylic paint most likely wont adhere to it properly. The shiny smooth surface should be roughed up a bit with fine sand paper, say 1200 or 1600 grit so as not to "gouge it" then primed.
    Didn't do any of that. :/


    Quote Originally Posted by NtheBasement View Post
    You should remove masking tape as soon as your paint dries,
    Well, I was waiting to see if it needed a second coat, but it was only on a few hours.
    I sort of primed it when I painted the whole board sky blue. I painted the other side white. The green mountains are painted over the layer of sky blue. Truthfully, I never had any problems till this. Short of doing the backdrops over I guess I am stuck with it. In the future I guess priming would be a good idea. I know there will be more times when I will want to protect the backdrop from work being done close to it. I am thinking I can clip wax paper to the back drop to protect from splash next time.
    I do hope to expand this layout sometime, so I hope I remember to prep the hard board for the backdrop next time. I need to start keeping notes.
    I seem to be good at finding the wrong way to do things. LOL
    Thanks again.
    Cheers!
    Maurice
    Attempting to apply the K.I.S.S. principle to Model Railroading.

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    Quote Originally Posted by Maurice View Post
    I sort of primed it when I painted the whole board sky blue.
    Paint is not primer, and primer is not paint! Different compositions. Many people try to economize or save effort here, but it usually backfires on them.

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    Also suggest keeping a role of the pink painter's tape on hand too. Not as aggressive as the blue tape and unless something needs a really sharp edge, I will use the pink for general masking. I use the blue tape or Tamiya yellow modeling tape with a pre-shot of dullcoat to seal the edge if I need a sharp edge on something.

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    Now, on the bright side. Oops like this will challenge you to screen it with trees, landscape or structures. The result, I bet, will be serendipitous.

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    Quote Originally Posted by dave68124 View Post
    Also suggest keeping a role of the pink painter's tape on hand too.
    I am not familiar with that, is it a 3M product as well?

    Quote Originally Posted by el Gato Gordo View Post
    Now, on the bright side. Oops like this will challenge you to screen it with trees, landscape or structures. The result, I bet, will be serendipitous.
    It's no big deal in the long run. I slopped on some craft paint on my crude mountain painting and you would never know it happened. It should have some lighter shades of green sponged on as well.
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    I gave the pavement area a shot of fixative mainly to preserve the weathering. I started placing my "Temporary" structures and yard details which led to another realization. You can't even see the area that was damaged anyway. LOL. I hope to build some backdrop structures that more closely resemble the prototype but for now these will do. All those lumber bundles need spacers under them so the fork lift can get the tines under them.
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    And yes, I removed the masking tape on the track right after these photos were taken. No residue left on the track. It will get wiped anyway, just to be sure.
    Cheers!
    Maurice
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    There is an alternative to blue tape which might work for you. It is paper tape, in varying widths, from 2 to 6 inches wide, which makes it suitable for spraying. It has a narrow wax strip instead of adhesive which holds gently but snuggly enough to prevent leaks. It is available in most paint stores.

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    There is a lot of good advice in this thread. I thought that I would add one more tidbit. When pulling masking tape off, do not pull it AWAY from the masked surface, pull it back along itself, parallel to the masked surface. This reduces the lifting force on the finish that was masked.

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    Good Morning All,

    While we're all masked up(Pun intended)...has anyone used the "green frog tape" on backdrops or models? Thanks!
    Happy Modeling

    Bruce

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    If you think this might happen, first stick the tape on your tee shirt a couple of times to reduce the stickiness.

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    Use the pink tape v. the blue tape on painted items. Also to Jan's point, paint and get it pulled up.

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