I have never painted anything before. I have seen photos of people painting their tin boats a certain color and the paint job looks like hell. Now, sure, not knowing the steps they took, or the lack of, but I was afraid that me painting this boat, would end up looking the same. I just don't want the boat to look like ***.
OK,
Now here is something for you to think about.
Enamels can be sensitive to the paint it is going over. If they are not compatible it may craze. We painted the back door of the fire station years ago and it wrinkled up like leather. People wanted to know where we got that custom door LOL.
So here are some tips for you...
Painting is a skill, it takes practice.
Test a small area to make sure the paint is compatible with what it is covering.
Make sure the primer is compatible with the top coat. It is always best to follow the directions on the can.
It may be a good idea to stick with the same brand and type for the primer and top coat.
If you are painting on top of old paint, primer may not be necessary. Test a spot just to make sure.
If the top coat is compatible with the old paint, 99 times out of 100 it is, make sure the surface is clean and decreased. You can use mineral spirits or acetone if using oil based enamel. I would not use the reducer for degreasing as that's a waste, thinner is fine.
You do not have to use reducer. Thinner is fine but it does take longer to dry.
You need to give the old paint a scuffing so it will grip the new paint. The old spray and pray body shops would wash cars with comet to give the old paint some tooth. I would just use medium grit sand paper to scuff it up. Bare metal sand throughs are OK.
Again make sure all dust, and grease is gone before painting.
When brush painting you'll find you have some work time, that is after you apply a coat you can go back over it with the brush to smooth out runs and strokes. After the work time it starts to get tacky and going back over it only makes the strokes worse so you have to learn how to "work the paint" with a brush and how long you can work the paint.
When enamel dries the brush strokes tend to smooth and disappear. Enamel is forgiving.
The coats need to have enough paint for coverage but not too much as it will run or sag as it dries.
If you paint with a brush buy a good one, a real natural hair brush. A cheap brush will make your paint job look like it was painted with a broom.
Clean that brush like your life depends on it. Simply leaving it in thinner will ruin it. The paint will set to it even submerged in thinner.
Paint out of a plastic bowl or pail, that way if you spill it you only loose whats in the bowl instead of the whole can.
The first thin coat may look very bad and streaky but you will find the following coats smooth out almost like magic.
Lastly, practice, practice, practice. You can see most of the above takes skill to execute. It's not hard but it does take skill. So before the boat, paint the mail box, the wheel barrow, the BBQ grill and stuff like tables and lawn furniture to get the feel of the brush. Most of this applys to spraying also.
Good luck.