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I made a bunker and covered a bit of it with sand using elmer's white glue. I let that dry for about 1hr and then primed it with walmart special. I then used watered down black to wash the sand and the sand in now coming off. I'm guessing the water in the wash is dissolving in the glue and causing the sand to fall off. What do you guys do to prevent this from happening?
I would glue the sand down then glue another layer on top. Leave it to set for more than an hour, more like over night then try painting it. You could also paint a watered down layer of glue on top to seal it all.
I hear and I forget, I see and I remember, I do and I understand
Success is the ability to go from failure to failure without losing your enthusiasm.
Yeah, one hour just isn't long enough. It will look dry (especially with all the sand) but that stuff can take about a day to dry rock-solid. It really is solid after that time though.
No more NG spearmen, thanks! Now I need some pump-wagons!
Pheonix Lord has the right idea in this one
I disagree about applying a layer of glue on top of the sand. You will lose much of the texture of the sand this way. As other have said, wait longer than an hour. PVA Glue is an air-dry material that dries from the outside inwards; just because the outer layer is dry does not mean the inner layer is dry.
Also consider Floral Glue as it is thicker.
I personally do not do this, but maybe a layer of primer after the glue has dries may work for you.
For my bases on my models I use superglue to put the sand down. If it is real fine sand or ballast that is all I do to it. If it is coarse I put down the superglue and then use a watered down elmers over that once it has dried.
For terrain I try to use superglue but it can get expensive. If it is a big piece I will use elmers and once it has dried I put a layer of watered down elmers over it. This keeps the little pieces from coming off and you don't loose detail because it is watered down. Really gets down in the cracks too.
The best tip I have is to use colored sand. I get fine black ballast and use it. This way if a few pieces flake off you have a hard time seeing it. For some reason my eye is just drawn to tiny spots of white far easier than tiny spots of black.
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you seriously don't need to use super glue! a thick coat of cheap PVA should always stick it, if not your doing something wrong.