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Do I prime the model before flocking or after. I'm not sure if painting the grit without primer is good or not. Thx in advance.

When you say flocking, do you mean sand, rocks, or other texture effect?
Rather than static grass, or similar effect?

If you are talking about the sand texture (or similar) then yes primer it and paint it, then if you wish to add any flock, then do that at the end

Yeah I should elaborate. I plan to use a autumn flock (grass) but was unsure as to what is considered more quality, primering sand grit and rocks, or doing that after the model was primered.

Well, flock is different than grit... Modeling flock is usually a fiber-like material used to simulate grass and weeds that most often comes in a variety of colors while basing grit is usually sand or small pebbles used to simulate dirt and rocks. Yes, you should absolutely prime bases with modeling grit/ballast/sand or whatever. Any kind of flock material is applied after the base has been painted.

I personally paint my models separately (attached to a blank base or most often pinned to corks) before placing them on their final base.

Sand would need sealing in, usually with watered down pva glue,before painting. but including the bases in the priming wouldnt hurt ontop. Brush painting is fine though.... I find it just saves that little bit of wear and tear on the brushes, as sand is a pretty rough thing to paint for the bristles.
To the point that I've stopped using sand tbh, I bought a 500ml tub of Windsor and Newton Mineral Texture Gel (they do others.. sand, black pummice...and some more, Liquitex do them too)
Its a similar effect to the citadel texture paints, only colourless; mix with a colour if you like, or paint over, or both. Think the 500ml bottle cost me about £10 and its looking to last a long time yet (based an army of 2-3k of dark angels with it so far and not even 25% used)

edit; sand or texture gel it doesnt matter -

apply texture and any rocks or general stuff you want on the base
if its sand,or any other porous material, seal it in as described above,
prime it the same way you prime the model before painting, most commonly this is a black spray (although I urge you to convert to grey primer for reasons not related to this thread at all)
Paint it up however you like.
apply any grass or snow flock, or other effects you might have that dont need painting.
Seal those in with spray varnish as necessary.
mount the model tot he base, ideally with pins, but maybe just glue.. remember lots of super glue leaves unsightly white marks a good reason to pin and use minimal glue here. (if you choose to mount at the end, if you paint while attached to the base ignore this step)

Appreciate the assistance guys, I've got what I needed.