（1）加热收缩完成后要回火5-8分钟，可使补口获得好的防腐密封性能，这

(1) Tempering for 5-8 minutes after the heating and shrinkage is completed, so that the patch can obtain a good anti-corrosion sealing performance, which is the key to the success or failure of the patch. <br>(2) Do not close the fire immediately after the shrinkage is completed. The hot melt adhesive becomes soft, sticky and fluid with the increase of the tempering time and temperature. Only then can the glue surface and the wet primer surface be sticky. Connection conditions

(1) After heating contraction to temper 5-8 minutes, can make the filling to obtain good anti-corrosion sealing performance, which is the key to the success or failure of the filling port anti-corrosion.<br>(2) Avoid shrinkage immediately after the completion of the fire, hot melt with the increase in tempering time, temperature increase and become soft, sticky, flow, then the adhesive surface and moist primer combination surface has bonding conditions.

(1) After heating shrinkage, tempering for 5-8 minutes can make the joint coating obtain good anti-corrosion and sealing performance, which is the key to the success or failure of joint coating and anti-corrosion.<br>(2) The hot melt adhesive will become soft, sticky and flowing with the increase of tempering time and temperature. At this time, the bonding surface can be bonded with the wet primer