Can I use a clear coat over semi-transparent?

Hi there,

• 1. State you live in : New York , Long Island. 

• 2. Full Shade, Partial Shade, or Full Sun: pergola on deck -full sun only on some areas 

• 3. Type of Wood-not sure 

• 4. Mold or Mildew Issues- no

• 5. Main Issues with Previous Stains -last one peeled after a year in the sunny spots . We layered on the stain very thick though. Our bad. 
• this year we tackled stripping, cleaning, sanding the deck. We added one coat of semi transparent stain. It’s the perfect color, I do not want it any thicker or more opaque. 
• question -can I , should I add a layer of clear transparent over the semitransparent for the extra wood protection? I do not want to add second coat of the semi-transparent. 
• behr water based products. 
• thank you for any advice. I googled a lot and couldn’t find exactly what I was looking for.