A Sunglow, per DonS, is not just an Amel with no borders. A Sunglow has an added red wash to it, that gives it added red/brightness.
DonS used to have a photo comapring an Amel with no borders and a Sunglow.
I do not know if they determined that Red Coat (recessive gene-DonS calls them Red Mask) is also a contributing gene as the Red Factor (dominant gene) in producing Sunglows.
If your Sunglow has RF, about half of the babies should be visual RF. Otherwise, all of the babies will be het Amel and Motley, as Megan said.