I asked pretty much this same question in an email to Duragloss recently. I use both PoorBoys and Duragloss products but never together. I just bought a new Mercedes ML350 which has a rock hard German paint called "Diamond White". It is stunning to say the least and should be as it was a very expensive option. The finish is flawless and a glaze is usually not used on perfect paint, however, I thought PoorBoy's "White Diamond" would enhance the depth and color with the gloss coming from the Duragloss 105 Polish. Longevity would be assured by using the Duragloss bonding agent (601) between the glaze and the polish/sealant. I have used the 601/105 combination on my silver pick up truck several times before and it is excellent but I never used them over the White Diamond glaze. In fact, I have never used the glaze at all.
Because of the bonding issues that could be present, I decided the best thing to do would be to contact Duragloss directly by email. Jerry at Duragloss wrote back saying that indeed a glaze would probably not be necessary on this new paint. In any event, if I used the glaze it could interfere with the bonding agent (601). I suppose I could just use 105 alone over the glaze but it works so well with the bonding agent that I would like to use them together for the added durability. 105 is good but with the bonding agent applied beforehand (or mixed together) it is great.
Based on what Duragloss said, if I decide to use the White Diamond glaze, I will not use it in conjunction with these specific Duragloss products. Rather, I will use the totally compatible PoorBoys World EX-Sealant w/Carnauba over the glaze. Then, in about four or five months or so, I will strip all of this and use nothing but the Duragloss 601/105 and topped with AquaWax (951). I will keep the White Diamond glaze out of the picture entirely. I will compare the two processes for length of service and durability as well as appearance.