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I usually start with a coarser paper, 80 - 120 just to take the "crust" off then hit it with a guide coat again and progressively move up to a finer paper.
If you go through the primer STOP (unless it's your filler)
3M makes a charcoal guide coat that I have used for years.
Here's an amazon link but you should be able to get it through your local jobber a lot cheaper
You put it on with a sponge like applicator (it's part of the the lid top) You don't have to put it on heavy, a very light coat will give you all the contrast you need.
1 container will easily do your airplane
Nice thing with this is you don't get stinky paint fumes and overspray
On Sat, Jan 16, 2021 at 8:21 PM Dorothea Keats <dkeats@...> wrote:
Good tip Mike. I use a two foot board mostly and a sanding block