为防止发生上述问题，必须采用干净的漆刷和漆桶。旧漆使用前，一定要用油漆滤纸或干净的尼龙丝袜过滤。另外，漆好的表面在油漆未干时要用罩子或硬纸板遮住，以防沾上灰尘。如果漆面毛糙，待其干透后，用干湿两用砂纸打磨光滑、擦净后，再重新刷上油漆。要特别注意漆刷必须是干净的。油漆不干室内通风不好或温度太低，油漆就干得慢。这是可以打开所有门窗促进通风，或在室内放一个加热器增加室温。如仍未能解决问题，则可能是上漆的表面油腻。
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一般固体材料中的声速随其温度升高而降低，有试验数据表明，热态材料每增加1C，声速下降1%。对于高温在役设备常常碰到这种情况。应选用高温和高温耦合剂（3－6C)，切勿使用普通。层叠材料、复合（非均质）材料。要测量未经耦合的层叠材料是不可能的，因超声波无法穿透未经耦合的空间，而且不能在复合（非均质）材料中匀速传播。对于由多层材料包扎制成的设备（像尿素高压设备），测厚时要特别注意，测厚仪的示值仅表示与接触的那层材料厚度。
