No mystery to it. Here is exactly what happens from the moment you call to the moment we hand the job back.
Joints inspected and measured, substrates identified, and adhesion tested. Product is selected for movement capability and substrate compatibility, not for what is on the truck.
A sample run installed, cured, and hand pull-tested to confirm adhesion and primer requirements. Color is approved against the wall in daylight since cured color differs from the tube.
Lift, stage, or rope access rigged, and sidewalks, glass, and landscaping protected. Tenants near the work get notice, particularly where windows must stay closed.
Old sealant removed to sound substrate on both faces, joints cleaned by grinding or a two-cloth solvent wipe, and dust blown out. Joints are sealed the same day they are prepped.
Backer rod set to depth, primer applied where required, sealant gunned and tooled to full contact on both joint faces. Tooling is what forces the hourglass profile that lets the joint move.
Sealant cures for the product's stated period, then spot adhesion checks and any water testing. Close-out should include product data sheets, warranty documents, and a marked-up elevation of what was replaced.
None of this is required — it just makes the visit quicker.