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

https://www.amazon.ca/3M-05861-Guide-Cartridge-Applicator/dp/B000PENEMM

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
along with a trouble light to look for lows and highs. I'll give the
light misting of black paint a try.  I put the primmer on with a roller
. I  have premarked  with a pencil any low spots I can feel with my
hand. The prime I use I have mixed with micro so I lay it on thick in
the low spots. Board sand it later. Your suggestion will make it all
that much better.   Take care---------------  Chris


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Mike Steinsland

mikeskustoms@...