What is the impact of clear anodizing and chem film on die cast parts?

Silicone does not anodize so when the part is cast there might be uneven distribution of silicone on the surface of the part, especially if the casting quality is poor. So during anodizing, the areas with increased silicon content will be a different color from the areas with pure aluminum. Note that even though Type II anodizing is considered clear it does slightly change the color of the base metal so the poorly anodized areas will be obvious. Also Type III anodizing is much darker due to it being a thicker coating, so the swirling effect might be even more obvious with type III anodizing. 

Alexander is correct about the potential for a poor appearance, but it all depends on the quality of the casting and subsequent anodizing. Your best option is to request some sample material from the company that will cast your part and have it anodized to see the result, but A380 is notoriously difficult to anodize. In terms of the Chem coat, I assume you mean chromate coating? These coatings are generally cheaper than anodizing and will tend to leave the part with a slight yellow tinge. Chromate coatings are often used as a primer for painting as it has excellent adhesive properties. So I would assume that they will also give excellent bond strength for the adhesives you have mentioned. Note that A380 is also known to produce a spotty appearance after chromate coating, due to the same reasons mentioned by other users.