What is the best 'mastic type' sealant for repairing cracks contained by feel roofing , ( garage) ?
Answers: dont use a sealant for that, if your in the UK go to a roofing suppliers or to b&q, buy some charitable of flash band, its probably called something else in this day and age! its similar to felt but maybe a bit thinner! you have need of a small blow torch to heat the back up to that time sticking it to the damages part of the felt!
I dream up its possible to buy bitumen based paint this can be painted over the cracks and will seal the edges. it used to be used to stamp the joints in wooden gutters,