Proper forearm warmup?

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As you have discovered in most cases Arm Pump is caused by a lack of warm up. Coach Seiji over on Racer X Virtual Trainer offers up a good warm up routine. http://www.racerxvt.com/article/race-weeks-and-warm-ups

Taking the bike off the stand, slow first lap?

do some pushups before you start riding

As much as possible stretch your forearms by presing your fingertips on anything while relaxing your wrist allowing it to be fully extended (90degrees or better). Hold this for a half minute or so , this is also done to stave off carpal tunnel. Just don't do it once , do it as much as possible. Even when driving to the track, at the quick mart counter waiting to pay ANY time.... you dig?

I took a 2' length of PVC, drilled a hole in the middle and tied a piece of rope
through it. Keep it in my gear bag. Then I take my helmet, tie it to the other
end and do that forearm twist exercise with it. You know- wind it up, wind
it down till your arms burn. I'll do it a couple times as I'm getting dressed
and gassing up.

get down on 4 and drill your knee into your forearm to try and stretch the fascia and get shit warmed up

like others have mentioned, WARM UP, its very important, hence, you see all pros in all sports disciplines warming up

use the first few laps as part of your warm up, go at about 50%, check the track, lines, this will help you relax,

Get a gyro or force ball from your local sporting good store, $10-20. A minute with that and your forearms will feel like they're going to explode.

Here's what works for me. I never get arm pump anymore:

-Release your grip in the air every now and then
-Run thicker grips
-Run your levers a little higher
-Find a comfy bar bend (for me, that means less sweep and not too low)
-Grip with your knees more
-Consciously hold on as loosely as you can

Oh yeah, warm up too.

Green nail polish

Same here and it works for me.

I used to get arm pump. I don't anymore. This is what I do.

On the way to the track, I do ONE set of each of these exercises with each hand: Your number of reps will be different from mine of course. It only takes one set for warm up.

1. 40-50 reps with a fairly light (but not too light) spring based hand grip. 40 lb. On ride/race day the point isn't to go to failure. It's to pre-pump your forearms. If I feel I can do 40 reps on that day, I'll do about 38.
https://www.athleteshop.com/everlast-extra-strength-hand-grips-wood?gcl…

2. 125 reps of a 1 lb stress ball, focusing on squeezing with your thumb and really press into it. The reason for this is that hand grippers don't work your thumbs at all, and the thumb is a maybe 25% of your grip so it's important.
https://www.amazon.com/Valeo-VA4478BK-RUBBER-SQUEEZE-BALL/dp/B000I1FALA…

3. Train during the week doing both weights (including forearms and grip) and get in some cardio. I do both when I can, but even when I have no time to workout during the week, steps 1 and 2 take care of the arm pump.

The stronger you are, especially your grip, but really overall, the less of your strength you'll have to use to hold on.

4. Of course, remember to breathe when you're riding, and keep your weight centered so you're not constantly pulling on the bars.

5.
If you really want to strengthen your grip check out the Captains of Crush Grippers. They're intense!
They say that most people who lift weights regularly cannot close the Level 1 grip. So, I'm starting with the Trainer 100 lb., which I can close but not for many reps, then working up to the level 1 (140 lb), level 2 (195 lb), etc... When you get to Level 3 (280 lb), you can get certified.

When I did my research 6 months ago, I found the Captains of Crush grippers to have the best reviews and consistency in the spring rate. They are intense for sure.

I'm just starting to train with them consistently.

https://www.amazon.com/Captains-Crush-Hand-Gripper-Point/dp/B006G377UQ/…