Tire Liners
If one is getting a lot of punctures from similar causes (thorns), wouldn't tire liners be a reasonable compromise to prevent leaks to begin with? This thread made me think of those Mr. Tuffy liners I have seen in stores and online. I have never used them as my risk of punctures is quite low. My understanding is that although there is an increase in weight, using multiple patches may add up to even more weight than the liners.
These haven't been mentioned in this thread which makes me think that they haven't been discovered by the group or that they are complete junk.