Engine bolt hole sealing

[gtflash]

Seen all suggestions. Over drilled then epoxy filled, sealant, adhesive etc. having just replaced transom, I want to get it right. What's the best method please

[office888]

Originally Posted by gtflash

Seen all suggestions. Over drilled then epoxy filled, sealant, adhesive etc. having just replaced transom, I want to get it right. What's the best method please

My procedure:
1. Mark & drill transom.
2. Wipe bolts and holes with acetone, allow 5 min to evaporated (degrease).
3. Liberally apply Sikaflex 291 to both the bolt holes and the bolts.
4. Hang engine, install bolts + washers + nuts.
5. Remove excess sealant with wipes + denatured alcohol.

[Dirk Diggler]

I was always taught Sika below the waterline, Silicon above..... And shit loads of it, followed by a proper clean up after fully tightened.

[butty]

Use Sitka 291, 3m 4200 or Saba tack 750. All good, as said before, lots on the bolts and in the holes, around the washer as you apply then it gets squeezed out as tighten, clean up with trade wipes or acetone.

I would avoid silicone on boats, in my opinion it does not adhere, it's great in bathrooms!!