1/4" diameter holes thru 1/4" thick fiberglass- fill

[HIFLUTIN]

Have a bunch of approx 1/4" diameter holes thru 1/4" thick fiberglass on a "verticle" surface that I need to fill before Gel-Coat, looking any easy suggest.I know Water resistant filler will "fill" but  fraid it might "pop-out" down the road, Iam no "glass expert" but can get by
Thanks

[seabob4]

I'd go with either Bondo-glass (basically Duraglass) or MarineTex.  Tape off the back sides of the holes, fill, DA flush, fill in any air voids, DA flush again, re-gel, DA and buff...

Bondo-glass is $12 a quart at Wally World.  We used Duraglass at WC/AS, same stuff...

[wingtime]

What Seabob suggests is perfect but I would go one step further and hit the holes just a tad with a countersink bit.  The chamfered edges will help prevent cracking and help prevent your filler from popping out.

[seabob4]

Wing, you are correct.  And, to go one step further, when installing hardware and equipment in smooth gel, c/sink your screw holes.  Gel won't chip out when you drive the screw in...

[Fletch170]

SeaBob,

I am waising my scuppers, is this the best way to fill the holes? Or should I glass the backs?

-Fletch

[seabob4]

SeaBob,

I am waising my scuppers, is this the best way to fill the holes? Or should I glass the backs?

-Fletch

Fletch,

Considering the size and location of the scupper drain holes, I'd use 2 layers of 24 oz. on the back sides, then as described above.  I really like the Bondo-glass as it has short strand glass in it...

[Fletch170]

Roger that Bob.

Thank you for your help.