First, bunkers are not natural to clay bases. The best solution is probably grass faced mostly flat sand bunkers. Otherwise handle them the way Cuscowill does and just allow the clay to contaminate...not a bad look...
Agree about the bunkers at Cuscowilla. It's a real red clay Georgia look!
Yep, those bunkers originally had bright white sand. Visited there in Dec. 97 (I think), and it was a wet winter. It was the beginning of the transition from white to orange.
Textile liners and power rakes don't mix well. If the sand gets a little thin, the bunker rake pulls up the liner. Using sod as a liner is an old method that works.
The sportcrete type liner might work in warmer climates, but it didn't make sense as Dunlop noted where you get below freezing. Roads in such climates get refractory cracks, so these thin layers of sprayed-on "protection" would seem to be vulnerable to breaking down due to expansion and contraction.
One way to reduce contamination (if you have sand faced bunkers) would be to have enough drainage so the water has somewhere to go after rains, but this isn't a guarantee against contamination either.