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Caulk Not Sticking to Fiberglass Shower

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We have recently had a new fiberglass shower surround installed and we are having a hard time getting the caulk to stick. When it is applied it looks great, but after a shower or two it starts to ripple and comes off. Any suggestions for preparing the fiberglass before reapplying the caulk?

Kathy from Champlin, MN

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Recent Answers

Here are the recent answer to this question.

By Debbie [1]03/03/2009

White vinegar will remove any soap scum that may be preventing the caulk from sticking.

By HSLINKS (Guest Post)01/14/2009

Any chance the seam was wet inside from the night before?

Any mold issues? If there is mold it will not stick

Fill the bathtub before putting in/on caulk. This will separate the tub & surround a little (you may not even see the difference). Water is about 8# per gallon so it adds up quickly

Wipe down with alcohol and make sure its dry. Take some tape and run it about 1/4 inch above and below where the caulk goes (leave enough area for the caulk - don't measure from the center line)

Buy silicon caulk - it comes in colours and clear.

Cut tip at a slight angle and don't cut too far down you want a small hole. Use bamboo skewer, hanger wire, long long nail etc to poke hole the seal

Have a small container of water, a rag. Run your bead of caulk all around the tub. Come back with finger dipped in water to smooth out the caulk - wipe off excess

Let dry. I carefully take a razor and barely scratch at the tape/caulk seam. Pull tape slowly.

Let it dry more. Read the label how long does it say before you can get it wet? I do a bath the first time not a shower just so I make SURE its done. Ria

By Harry (Guest Post)01/08/2009

My first question is what type of caulking are you using; not the brand. The area to be caulked should be clean and dry. I would apply a silicone sealer. Other types of sealer may not be compatibly with the water.

By Cajun [55]01/08/2009

You can wipe the surface area down with Denatured Alcohol, or for a more industrial cleansing, try Acetone...(if you can find it....Acetone is now in the 'cancerous' listings, along with sex and breathing air )
Both are available in the Hardware Dept...
Read the applications on the tubing; and check with Ace Hardware for a better selection of types..

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