Worry-wort here. Am doing some porch repairs - simple carpentry - but rain adds another dimension. Always have to consider "what would rain do"

If I was to glue 2 boards together (a 1x6 and a 1x2) sandwich style ie joint runs horizontally & in same direction as wood grain - can I assume that this joint would be as good as solid wood and impervious to rain getting in and deteriorating the wood over time? It will be well clamped, also primed/painted but will the joint loosen over time and develop a visible crack allowing water to get in?

The alternative - cutting/shaping a thicker 2x 6 board - would be too much of a monumental task - but I could hire someone else to do if I have to.