I would use green scotch bright pads to scuff it up first. Would make the job so much easier than paper. Due to the nooks and crannies of the innards.
Then use Duplicolor primer and paint. It is an inexpensive and easy to find brand. Do not mix brands for best results.
You really do not need to prime first, but it makes for much nicer and durable paint jobs. Since you may, be thinking flat black.. I would be and am. Sometime this summer, my 690 is getting painted. . I suggest dark primer. Not the light Grey. An etching primer would be a good pick, but costs a little bit more.
Lay the paint on a clean surface properly cleaned. Oh, I must of said cleaned more than once.. Dangit, I said cleaned yet again.
They make a wash specific for paint prep. To rid it of oils from your skin and dust. If not, you can get an uneven surface, or it will not adhere like it should. Or you can get what is called orange peeling. Ever seen a paint job that looked dimpled or had the surface like an orange skin.. There is also fish eye. Which is from not being clean. It looks like a divet/spot/hole in the paint? Not clean..
Once you get that done. Simply use light coats building it up until your done. I would rather have 5 coats of light paint application. Than one or two coats of heavy application. Plus not only will it look more natural. You have less chance of the paint sagging. Which is also called a run. Trust me, light coats are worth the time and effort. in both how it ends up and the ability to sand in between coats faster.
For the best results. Sand with a really fine grit in between coats. Letting everything dry in between coats. Just don't rush it, reading the specific instruction on the spray cans.
One thing I am poking around about. Is to see if there is a product that is spray on and sound deadening in the color of black.. Hopefully not like $40 a can. Since for the inside of the CM690, I estimate two spray paint cans. For a good flat black finish. One can of primer would work.
Taking the time to do it right. Will give you a fantastic result. Plus be durable for a very long time. They do sell sealer that is not shiny. But if you do it right and let it dry properly or cleaning between coats. Once you clean, do not touch the surface.. You may not have to seal it. Let the stuff dry proper. That is the biggest mistake non-painters make. Rushing the paint, when all it does is waste all the efforts for a nice finish. All brands of paint I ever seen had dry times on the cans. Plus temperatures to get a good finish.
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