Evaporust is the same way... full submersion is necessary or that permanent line forms.
Last week I was doing a plated bunny, in a plastic box, and I needed a wee bit more EVAPO....
So, I filled up Ziploc FREEZER bags with water, sealed them tight, and placed them in two corners to displace the solution, and raise the level above the bunny!
You get real inventive with the 'expensive' stuff... ;) ;)
and another word of caution... if you decide to put a piece in the Electro, AFTER having used Evaporust (which contains some Heavy Duty detergent agents), BE VERY sure you have scrubbed off ALL traces of the chelating agent.
2 years ago, I forgot a piece had been set aside and the Evapo dried on it... sat there until Spring. I then plopped it in the Electro, and walked away...
Ughhh... I went to check the piece and it looked like a Bubble Bath, with suds n foam flowing out of the electro, all over the Garage floor... and nasty yellow water in the electro... so... lesson learned!
Pumped the electro out (50 + gallons), rinsed and rinsed, and refilled...... Won't forget again..... ::) ::)