Be careful to only go as deep as the blister.
Patching flat roof with tar.
A tar and gravel roof can be repaired by applying tar to the damage using the caulk gun smoothing it with the putty knife or brush and covering the tar with reinforcing mesh followed by a layer of gravel.
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The best you could do to repair a flat roof was to pour some tar on the leaky spot.
Tar the roof keep your tar bucket close to you as you start spreading the tar on the surface with the roller.
As you work you will move back toward the end where your ladder is taking the bucket with you.
Use small amounts and apply it with the roller in short smooth strokes.
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As you see it is a constant repair cycle until a new.
Cut through the bubble end to end with a utility knife.
In fact tar was pretty much the only feasible option.
New leaks would form elsewhere.
If the cost of the roof repair is truly bothering you consider making your own temporary repair by tacking a tarp over the roof or cutting up some sheet metal into shingles and using these to patch the roof.